Trump delivers remarks at Pentagon's 9/11 remembrance ceremony

Americans are marking 24 years since the Sept. 11, 2001, attacks with solemn ceremonies, volunteer work and other tributes honoring the victims.

NEW YORK — Americans are marking 24 years since the Sept. 11, 2001, attacks on Thursday with solemn ceremonies, volunteer work and other tributes honoring the victims.

Many loved ones of the nearly 3,000 people killed joined dignitaries and politicians at commemorations Thursday in New York, at the Pentagon and in Shanksville, Pennsylvania.

President Donald Trump and first lady Melania Trump attended the service at the Pentagon in Virginia where 184 service members and civilians were killed when hijackers steered a jetliner into the headquarters of the U.S. military.

"On that fateful day, savage monsters attacked the very symbols of our civilization. Yet here in Virginia and in New York and in the skies over Pennsylvania, Americans did not hesitate," Trump said in his remarks, which included anecdotes about victims of the attack. "They stood on their feet, and they showed the world that we will never yield, we will never bend, we will never give up, and our great American flag will never, ever fail."

Trump warned that if the U.S. is attacked, "We will hunt you down."