Events around the U.S. commemorated the 16th anniversary of the 9/11 terror attacks. Pictured: One World Trade Center is reflected in the window of the National 9/11 Museum in New York City.
Navy Midshipmen stand arm and arm during a 9/11 tribute during the Navy and Tulane Green Wave game at Navy-Marine Corp Memorial Stadium on Sept. 9, 2017, in Annapolis, Maryland.
Visitors gather to pay respects during the Flight 93 National Memorial's annual Luminaria on the eve of 16th Anniversary ceremony in Shanksville, Pennsylvania. United Airlines Flight 93 crashed into a field outside Shanksville with 40 passengers and 4 hijackers aboard on Sept. 11, 2001.
Firefighters hold up a flag that flew at the World Trade Center at the start of a commemoration ceremony for the victims of the 9/11 terrorist attacks at the National September 11 Memorial on Sept. 11 in New York City.
A photo of a victim is left at the North pool at the National September 11 Memorial.
A flower is left at the North pool.
A New York City Police Department officer pauses while visiting the North pool.
U.S. President Donald Trump and first lady Melania Trump, flanked by White House staff, place their hands over their hearts on the South Lawn of the White House during the playing of "Taps" at a ceremony marking the Sept. 11 attacks.
Ivanka Trump and Jared Kushner attend the ceremony.
The president and the first lady at the ceremony.
U.S. Attorney General Jeff Sessions speaks during a vigil ceremony at the Department of Justice in Washington, D.C.
A National Park Service Ranger presents a wreath to Vice President Mike Pence and Interior Secretary Ryan Zinke at the Flight 93 National Memorial in Shanksville, Pennsylvania. United Airlines Flight 93 crashed into a field outside Shanksville with 40 passengers and 4 hijackers aboard on Sept. 11, 2001.
U.S. Navy Captain William Sherrod holds a flag from the USS Somerset to present to family members of the the victims.
Pence and his wife, Karen, tour the Flight 93 National Memorial.
Pence speaks at the memorial.
A wreath at the memorial.
Jeremy Hellickson and Caleb Joseph of the Baltimore Orioles and teammates observe a moment of silence before the start of their MLB game against the Toronto Blue Jays on Monday.