At least nine people are dead, including three American soldiers, after a suicide bomber drove his motorcycle into a crowd of troops and detonated the explosives Wednesday, the New York Times reported.
The Taliban has taken responsibility for the attack in Faryab, one of several in recent days targetting Afghan troops.
Some initial reports said that the attack was a roadside bomb, which the police chief of Faryab, Abdul Khaliq Aqsai, denied.
Afghan intelligence officers said that the bomber might have been wearing an Afghan police uniform, the Los Angeles Times reported.
Faryab is believed to house Al Qaeda-linked militant groups but generally is considered a quiet province.
The three American soldiers killed in the attack have not been identified.