Sources: 3 US troops, 15 Afghans feared dead

WASHINGTON

Officials spoke on condition of anonymity Wednesday because details of the incident were sketchy and the officials weren't authorized to talk about it publicly.

Early reports from Afghans said a car packed with explosives rammed into vehicles in an international military convoy. But U.S. Defense Department officials say it's not clear whether it was a convoy. A suicide vest is suspected to have been used.

While the Americans believed killed were all members of the military, U.S. officials say the Afghans appear to be a mix of security forces and civilians.

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