Police say more than 2,000 angry Afghans are protesting the improper disposal of Korans and other Islamic religious materials at an American air base north of Kabul.
The demonstrators are shouting "Die, die, foreigners!" They started gathering Tuesday morning after learning of the incident at Bagram Air Field.
Local Afghan leader, Ahmad Zaki Zahed, says U.S. military officials have given him about 30 Korans and other religious books that were used by detainees once incarcerated at the base.
He says some were burned, but others were retrieved from the trash before they were burned.
Gen. John Allen, the U.S. commander of international troops in Afghanistan, has ordered an investigation into what he says was an unintentional disposal of the Islamic materials.
"We are thoroughly investigating the incident and are taking steps to ensure this does not ever happen again," Allen, the top commander of U.S. and NATO troops in Afghanistan, said in a statement. "I assure you, I promise you, this was not intentional in any way."
Allen said he received a report during the night that people working for the military coalition improperly disposed of the religious materials. He did not elaborate.
"When we learned of these actions, we immediately intervened and stopped them," Allen said. "The materials recovered will be properly handled by appropriate religious authorities."
Ahmad Kabir, the chief of Bagram district of Parwan province where the base is located, said the demonstrators were all people who work inside the base and that some claimed they had seen pieces of a Koran that was burned inside the base.
"I haven't seen it myself and we are talking to them and are investigating to see if is true," Kabir said. "The protesters are nervous over these claims of the holy book being burned."
Kabir called for calm.
"We will investigate and we are asking everyone to calm down and relax," he said, adding that the incident was being probed by local Afghan and police officials and the local provincial council.
Police said a similar protest on Tuesday just east of Kabul ended peacefully.