Afghan authorities are enforcing a strict nighttime curfew in Kabul, hours after what appeared to be the worst riots in the capital since the Taleban was ousted in 2001.
At least 13 people died in the violence, and dozens of others were seriously wounded.
The riots erupted after a U.S. military vehicle accidentally crashed into civilian vehicles. Local officials say the crash killed at least five people and injured several others.
Within minutes, protests erupted near the wreckage, and hundreds of people threw rocks and debris at U.S. soldiers. Protesters also set police vehicles on fire and chanted anti-American slogans. Some witnesses say they saw U.S. soldiers open fire, while others say local police were responsible for the casualties.
A U.S. military spokesman ,Colonel Thomas Collins says American troops only fired warning shots into the air.
The spokesman said the incident is being investigated.
Afghan President Hamid Karzai called on the Afghan people to stand up against rioters who looted and destroyed property in Kabul. In a televised address Monday night, he described the rioters as "agitators" and enemies of Afghanistan.