Wednesday marks the 30th anniversary of the suicide bombing that killed 241 Americans at the U.S. Marine barracks in Beirut, Lebanon.
A devastating truck-bomb explosion killed 220 Marines, 18 sailors and three soldiers - all part of a multinational force trying to end the Lebanese civil war - on October 23, 1983.
U.S. President Barack Obama denounced the bombing, which has been attributed to Hezbollah, and mourned the terrorists' victims in a statement Wednesday.
Obama said the "despicable act of terrorism" marked the deadliest single-day toll for U.S. Marines since the World War II battle of Iwo Jima.
He paid tribute to those killed and honored the "courage and bravery" of the those who spent days digging victims out of the rubble.
Less than an hour after the attack on the U.S. base, another suicide bomber detonated his explosives outside the French barracks in Lebanon, killing 58 paratroopers.