At least 13 U.S. service members were killed in Kabul, Afghanistan, on Saturday when a suicide bomber struck a vehicle in a NATO military convoy, NATO and U.S. military officials said.
The U.S. official emphasized details are continuing to unfold. A heavily damaged vehicle is believed to be an armored bus that was carrying U.S. troops in the convoy.
The deaths were the largest single-day U.S. loss in Afghanistan since the August crash in Afghanistan's Wardak province that killed 38 people, including 22 Navy SEALs.
Saturday's attack caused a "number" of NATO and local Afghan casualties, NATO's International Security Assistance Force said in a statement
Four Afghans also were reported dead. It was unclear how many people were wounded, said Sediq Sediqqi, a spokesman for Afghanistan's Interior Ministry.
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