At least 10 people have been killed and several mosques and churches have been burned during anti-American riots in the northern Nigerian city of Kano. The Muslim-dominated city has a history of religious violence between Christians and Muslims.

The violence erupted as about 5,000 radical Muslim demonstrators were protesting U.S.-led air strikes against Afghanistan.

Some of the demonstrators shouted slogans denouncing President George Bush while others carried signs supporting Osama bin Laden, the suspected mastermind of the September 11 terrorist attacks in the United States.

Kano state officials say 10 people were killed during the riots. However, witnesses say they saw many more bodies. Witness accounts indicate the city's central mosque, 15 smaller mosques and several churches were burned in the rioting.

Kano state officials say calm has returned to the state capital, whose streets are now being patrolled by police. Authorities say they have imposed a curfew.

However, tension remains high in the city of Kano, where the state police commissioner has ordered his forces to shoot any demonstrators on sight.

Saturday's violence comes one day after another round of anti-American protests in the largely Muslim city.

Tensions between Muslims and Christians have increased in Kano state since the state government imposed the strict Islamic Sharia law in April of last year.

Christians are wary of Sharia law, which imposes strict corporal punishment for crimes, including the cutting off of body limbs.