The causes of the protests in Afghanistan

Protesters in Kabul interviewed on the road and in front of Parliament said that this was not the first time that Americans had violated Afghan cultural and religious traditions and that an apology was not enough.

"This is not just about dishonoring the Koran, it is about disrespecting our dead and killing our children," said Maruf Hotak, 60, a man who joined the crowd on the outskirts of Kabul, referring to an episode in Helmand Province when American Marines urinated on the dead bodies of men they described as insurgents and to a recent erroneous airstrike on civilians in Kapisa Province that killed eight young Afghans.

"They always admit their mistakes," he said. "They burn our Koran and then they apologize. You can't just disrespect our holy book and kill our innocent children and make a small apology."

Members of Parliament called on Afghans to take up arms against the American military, and Western officials said they feared that conservative mullahs might incite more violence at the weekly Friday Prayer, when a large number of people worship at mosques.

"Americans are invaders, and jihad against Americans is an obligation," said Abdul Sattar Khawasi, a member of Parliament from the Ghorband district in Parwan Province, where at least four demonstrators were killed in confrontations with the police on Wednesday.