Afghan police say a suicide bomber has killed nine school pupils and a policeman outside a market in the country's east. They say the attacker was targeting a passing U.S. military patrol but it was unclear if there were any American casualties.

Gen. Zelmia Oryakhail, provincial police chief of Paktia province, said the bomber was on a motorbike and detonated his explosives at midday Monday outside the market in Samkani district as the American forces passed. He said a local school had just let students out for lunch.

He said 15 other students were wounded. He did not say how old they were.

He could not give information about the American patrol. The international coalition didn't immediately confirm the incident.