US marks 9/11 with somber tributes; Trump speaks at PA site

Cheryl Alpert of Weston, Mass., pauses to think about her best friend, Myra Aronson of Boston, after adding a flower and photograph of Aronson to the flag display in memory of victims of the terrorist attacks of Sept. 11, 2001, at Weston Town Green in Weston, Mass. Aronson, 50, a public relations professional, was on her way to a conference in California aboard American Airlines Flight 11 when she and 91 others died after the plane crashed into the North Tower at the World Trade Center. Alpert had plans to join her friend of 25 years on the trip but cancelled several days prior. (Ken McGagh/The Metro West Daily News via AP)

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.