U.S. marks 9/11 with somber tributes; Trump speaks at PA site

Audience members attend the September 11th Flight 93 Memorial Service, Tuesday, Sept. 11, 2018, in Shanksville, Pa. President Donald Trump is marking 17 years since the worst terrorist attack on U.S. soil by visiting the Pennsylvania field that became a Sept. 11 memorial. (AP Photo/Evan Vucci)

NEW YORK — Americans looked back on 9/11 Tuesday with tears and somber tributes as President Donald Trump hailed “the moment when America fought back” on one of the hijacked planes used as weapons in the deadliest terror attack on U.S. soil.