Update at 10:40 a.m. ET
On the 13th anniversary of the Sept. 11 attacks, President Obama, first lady Michelle Obama and Vice President Joe Biden gathered on the White House lawn to observe a moment of silence.
The solemn commemoration of the attacks that killed some 3,000 people came just hours after the president addressed the nation on a strategy to "degrade and destroy" Islamic State militants in Iraq — a stark reminder that the so-called "war on terror" appears to be far from over.
At a ceremony at the Pentagon, the president said "we carry on, because as Americans, we do not give in to fear. Ever."
Other Sept. 11-related events scheduled for today include a gathering at New York's ground zero for relatives of victims of the World Trade Center attacks with a reading of names of those killed. A similar ceremony is being held at Shanksville, Pa., in the field where hijacked United Flight 93 went down, killing all 40 passengers and crew aboard.