Violent protests have continued across Afghanistan, after copies of the Koran were burned at Bagram Air Field, the main American base in the country.
At least five demonstrators were killed in the latest action. Two US soldiers have also died.
Afghan President Hamid Karzai appealed for calm, but his words have done little to temper the spiralling fury.
It was Afghan workers who spotted the Koran being burned at Bagram.
“I found several chapters of the Koran in the fire,” said labourer Sayed Jamil. “It was in an area where everything belonged to the Americans. It was their rubbish,” he added.
The burning of the Muslim holy book is the latest embarrassment for the US in Afghanistan. Last month, video emerged apparently showing US soldiers urinating on the corpses of Taliban fighters.