WASHINGTON, DC - SEPTEMBER 11: U.S. President Donald Trump and first lady Melania Trump place their hands over their hearts on the South Lawn of the White House during the playing of "Taps" at a ceremony marking the September 11 attacks September 11, 2017 in Washington, DC. Today marks the 16th anniversary of the attacks that killed almost 3,000 people and wounded another 6,000. (Photo by Win McNamee/Getty Images)

A second bell has tolled at 9:03 a.m. at ground zero to mark the moment a second terrorist-piloted plane slammed into the World Trade Center’s south tower. Monday marked the 16th anniversary of the Sept. 11 terror attacks. Then victims’ relatives again began reading the names of the nearly 3,000 people killed when four hijacked planes hit the trade center, the Pentagon and a Pennsylvania field on Sept. 11, 2001. Republican President Donald Trump, a native New Yorker, observed a moment of silence at the White House and then participating in an observance at the Pentagon. It’s his first time observing the anniversary as president.

President Donald Trump says during a 9/11 ceremony at the Pentagon that the nation grieves for the people “who were murdered by terrorists” 16 years ago. The president and first lady Melania Trump joined with Defense Secretary Jim Mattis, members of his Cabinet and military personnel at the Pentagon to observe the anniversary of the attacks on the nation’s defense headquarters. The president is issuing a warning to extremists, saying “America cannot be intimidated” and those who try will join the list of enemies “who dared to test our mettle.” He says when America is united, “no force on earth can break us apart.”

Vice President Mike Pence is addressing the family and friends of the victims of United Flight 93 and the hundreds of citizens attending the somber service in Pennsylvania. Pence tells the crowd he was in Washington as a member of Congress on 9/11. That’s where he learned a hijacked plane was heading to the U.S. Capitol and was only 12 minutes away. He says that was the longest 12 minutes of his life, but he soon learned the plane went down in a field in Shanksville, Pennsylvania. Thirty-three passengers and seven crew members were killed. The ceremony started at 9:45 a.m., the time that federal investigators determined passengers decided to revolt against their four al-Qaeda hijackers, who ended up crashing the plane in a field 60 miles southeast of Pittsburgh. Pence says those passengers might well have save his life.