The President and First Lady at the Pentagon ceremony this morning

America stopped to remember the 9/11 terror attacks today as a new memorial was dedicated to the hundreds of emergency workers who have succumbed to diseases linked to the atrocity over the past 16 years.

At the White House President Trump and his wife, Melania, led a moment of silence to mark an assault that claimed about 3,000 lives on this day in 2001.

At 8:46am — the moment the first plane struck the World Trade Centre in New York — a bell tolled. A Marine bugler played Taps, and Mr Trump and the First Lady placed hands over their hearts.

President Trump meeting military personnel outside the Pentagon KEVIN LAMARQUE/REUTERS

The first couple later laid a wreath at another observance event at the defence department.

“America cannot be intimidated,” the President told the