Smoke and debris in the air during the September 11 terrorist attack on the World Trade Center, New York City. Courtesy of… https://www.rawpixel.com/image/3978615/photo-image-smoke-fire-cityFree Image from public domain licenseRescue officer carrying the American flag during the aftermath of the September 11 terrorist attack on the World Trade… https://www.rawpixel.com/image/3978708/photo-image-smoke-person-cityFree Image from public domain licenseRescue officer carrying an axe during the aftermath of the September 11 terrorist attack on the World Trade Center, New York… https://www.rawpixel.com/image/3978599/photo-image-paper-face-mask-smokeFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978607/photo-image-smoke-people-cityFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978606/photo-image-paper-face-mask-smokeFree Image from public domain licenseSmoke and debris in the air while rescue operations is being carried out during the September 11 terrorist attack on the… https://www.rawpixel.com/image/3978702/photo-image-smoke-people-cityFree Image from public domain licenseRescue officer during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City. Courtesy… https://www.rawpixel.com/image/3978700/photo-image-paper-smoke-peopleFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978681/photo-image-mask-smoke-peopleFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978613/photo-image-smoke-people-cityFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978623/photo-image-smoke-people-cityFree Image from public domain licenseNew York, N.Y. (Sept. 14, 2001) – What is left of the south tower of the World Trade Center in New York City, stands like a… https://www.rawpixel.com/image/8717938/photo-image-public-domain-people-new-yorkFree Image from public domain licenseCivilians looking for shelter during the September 11 terrorist attack on the World Trade Center, New York City. Courtesy of… https://www.rawpixel.com/image/3978594/photo-image-smoke-people-womanFree Image from public domain licenseNew York, NY, September 28, 2001 -- Debris on surrounding roofs at the site of the World Trade Center. Photo by Andrea… https://www.rawpixel.com/image/8718132/photo-image-public-domain-person-worldFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4048780/photo-image-public-domain-hand-personFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978709/photo-image-paper-smoke-peopleFree Image from public domain licenseRescue officers ceasing the fire during the aftermath of the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978601/photo-image-smoke-people-waterFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978694/photo-image-mask-smoke-peopleFree Image from public domain licenseRescue officer during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City. Courtesy… https://www.rawpixel.com/image/3978590/photo-image-smoke-person-cityFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978618/pdlocwtc-0076u-imagetifFree Image from public domain licenseSmoke and debris in the air during the September 11 terrorist attack on the World Trade Center, New York City. Courtesy of… https://www.rawpixel.com/image/3978600/photo-image-smoke-person-cityFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978690/photo-image-smoke-people-cityFree Image from public domain licenseNew York City firefighters after 9/11 attacksNEW YORK — New York City firefighters take a much needed break during… https://www.rawpixel.com/image/4030877/photo-image-people-construction-manFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4048775/photo-image-public-domain-peopleFree Image from public domain licenseDisaster relief Instagram post template https://www.rawpixel.com/image/14822582/disaster-relief-instagram-post-templateView licenseDisaster relief Instagram post template https://www.rawpixel.com/image/14823077/disaster-relief-instagram-post-templateView licenseRescue officers ceasing the fire during the aftermath of the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978610/photo-image-smoke-people-waterFree Image from public domain licenseRescue officer and rescue truck during the aftermath of the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978697/photo-image-smoke-people-fireFree Image from public domain licenseCasualty transported by a stretcher during the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978617/photo-image-smoke-people-cityFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978611/photo-image-mask-smoke-peopleFree Image from public domain licenseRescue officer carrying a hose during the aftermath of the September 11 terrorist attack on the World Trade Center, New York… https://www.rawpixel.com/image/3978711/photo-image-paper-smoke-peopleFree Image from public domain licenseRescue officers during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City. Courtesy… https://www.rawpixel.com/image/3978706/pdlocwtc-0206u-imagetifFree Image from public domain licenseView of the One World Trade Center and the 9-11 memorial with the names of the victims. Original public domain image from… https://www.rawpixel.com/image/4048796/photo-image-flower-public-domain-cityFree Image from public domain licenseCollapsed buildings and debris in the World Financial Center during the September 11 terrorist attack on the World Trade… https://www.rawpixel.com/image/3978705/photo-image-paper-smoke-peopleFree Image from public domain licenseCollapsed buildings in the World Financial Center during the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978712/photo-image-paper-smoke-peopleFree Image from public domain licenseSmoke fuming in the air during the September 11 terrorist attack on the World Trade Center, New York City. Courtesy of the… https://www.rawpixel.com/image/3978609/photo-image-smoke-fire-cityFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978677/photo-image-smoke-people-public-domainFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978616/photo-image-smoke-people-waterFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978707/photo-image-smoke-people-fireFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978755/photo-image-smoke-people-cityFree Image from public domain licenseThe September 11 terrorist attack on the World Trade Center, New York City. Courtesy of the Prints and Photographs Division… https://www.rawpixel.com/image/3978704/photo-image-tree-smoke-public-domainFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4046178/photo-image-people-public-domainFree Image from public domain licenseUSACE emergency operations teammate looks over the rubble at Ground Zero after the 9/11 attacks https://www.rawpixel.com/image/4036544/photo-image-logo-person-natureFree Image from public domain licenseSmoke fuming in the air during the September 11 terrorist attack at the World Trade Center, New York City. Courtesy of the… https://www.rawpixel.com/image/3978614/photo-image-smoke-fire-cityFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978621/pdlocwtc-0086u-imagetifFree Image from public domain licenseNYPD officer and NYPD car during the aftermath of the September 11 terrorist attack on the World Trade Center, New York… https://www.rawpixel.com/image/3978602/photo-image-paper-smoke-peopleFree Image from public domain licenseSearch & rescue operations near collapsed buildings during the aftermath of the September 11 terrorist attack on the World… https://www.rawpixel.com/image/3978584/photo-image-smoke-people-cityFree Image from public domain licenseRescue officers wearing N95 mask during the aftermath of the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978604/photo-image-paper-face-mask-smokeFree Image from public domain licenseRescue operations ceasing the fire during the aftermath of the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978624/photo-image-person-water-cityFree Image from public domain licenseCollapsed buildings in the World Financial Center during the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978701/photo-image-paper-smoke-peopleFree Image from public domain licenseRescue operations and rescue truck during the aftermath of the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978603/pdlocwtc-0191u-imagetifFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978685/photo-image-paper-smoke-peopleFree Image from public domain licenseSmoke and debris in the air while rescue operations are being carried out during the September 11 terrorist attack on the… https://www.rawpixel.com/image/3978620/photo-image-smoke-people-waterFree Image from public domain licenseRescue officers ceasing the fire during the aftermath of the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978605/photo-image-smoke-person-waterFree Image from public domain licenseRescue officers ceasing the fire during the aftermath of the September 11 terrorist attack on the World Trade Center, New… https://www.rawpixel.com/image/3978619/photo-image-smoke-people-waterFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978608/photo-image-smoke-people-waterFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978622/pdlocwtc-0196u-imagetifFree Image from public domain licenseRescue operations during the aftermath of the September 11 terrorist attack on the World Trade Center, New York City.… https://www.rawpixel.com/image/3978612/pdlocwtc-0216u-imagetifFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4051356/photo-image-person-public-domainFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4051367/photo-image-public-domain-american-flagFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4046162/photo-image-person-public-domainFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4046166/photo-image-people-public-domainFree Image from public domain licenseThe North Portico of the White House is decorated in observance of the 20th anniversary of the September 11, 2001 attacks… https://www.rawpixel.com/image/9653116/photo-image-public-domain-house-archFree Image from public domain license The 9/11 Memorial in Overland Park, Kansas, a Kansas City suburb, includes parts of steel columns… https://www.rawpixel.com/image/8066336/photo-image-plant-grass-treeFree Image from public domain licenseThe "Tower of Light" Tribute commemorating the 9/11 attack on the Pentagon is seen behind the White House Saturday… https://www.rawpixel.com/image/9652111/photo-image-light-public-domain-houseFree Image from public domain licenseGrand Turk Island is an island in the Turks and Caicos Islands in the Caribbean, and contains the territory's capital… https://www.rawpixel.com/image/441237/free-photo-image-nasa-2001-mapsFree Image from public domain licenseBlue Mass is held at St. Patrick’s Cathedral to honor fallen police during the annual event in Washington, D.C., September… https://www.rawpixel.com/image/8742143/photo-image-public-domain-personFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4046165/photo-image-logo-peopleFree Image from public domain licenseA U.S. Border Patrol agent plays the bagpipes as U.S. Customs and Border Protection officers and agents attend Blue Mass at… https://www.rawpixel.com/image/8742243/photo-image-border-public-domain-blueFree Image from public domain licenseNew York (Sept. 11, 2019) Acting Homeland Security Secretary Kevin McAleenan traveled to New York City to attend the… https://www.rawpixel.com/image/4051361/photo-image-flower-tree-artFree Image from public domain licenseRemarks are made during Blue Mass at St. Patrick’s Cathedral to honor fallen police during the annual event in Washington… https://www.rawpixel.com/image/8742122/photo-image-public-domain-blue-personFree Image from public domain license