Former President Obama tweeted a remembrance for the victims of 9/11, marking the 16th anniversary of the terror attacks.

“We remember everyone we lost on 9/11 and honor all who defend our country and our ideals. No act of terror will ever change who we are,” Obama tweeted Monday.

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Members of the Trump administration attended ceremonies memorializing the attacks or released statements marking the anniversary.

President Trump and first lady Melania Trump held a moment of silence on the South Lawn of the White House early Monday, timing it to mark the moment that the first plane hit the World Trade Center.

Trump later made remarks honoring the victims of the attacks at the Pentagon, vowing to attack extremist groups that threaten the American people.

“The terrorists who attacked us thought they could incite fear and weaken our spirit,” Trump said. “But America cannot be intimidated, and those who try will soon join the list of vanquished enemies who dared to test our mettle.”

Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE also released a statement marking the occasion, noting the Department of Justice's crackdown on terrorism since the attacks.

"The first civil right is to be alive," he said.