NAIROBI (Reuters) - Kenyan security forces fired assault rifles and teargas at hundreds of Muslims protesting in the capital on Friday against the detention of Jamaican cleric Sheikh Abdullah al-Faisal. Chanting Allahu Akbar (God is Greatest), the demonstrators were blocked by police with dogs as they tried to march through the heart of Nairobi after prayers at the downtown mosque. Some Kenyans, furious the banned protest had taken place, joined forces with the police and began hurling stones at the marchers, most of whom were squeezed back towards the mosque after prolonged street skirmishes. As night fell there was still a standoff outside the mosque, with police keeping Kenyans gathered in the streets apart from the Muslim protesters. One protester in fatigues and a black balaclava waved the flag of Al-Shabaab - the Somali group that Washington accuses of being Al-Qaedas proxy - and taunted the crowds by drawing his finger across his throat in a slitting motion. Somali President Sheikh Sharif Ahmed said it was unfortunate Kenyan security had been disrupted in the name of religion. I am calling for Somalis to support peace, and respect their host. Kenya, like any other sovereign state, has the right to deport whoever it considers to be a national security threat, he told Reuters in Nairobi. Faisal was deported from Britain in 2007 for preaching racial hatred and urging his audiences to kill Jews, Hindus and Westerners. He was visiting the east African nation, which has a large Somali community in Nairobi, for a preaching tour when he was taken into custody. One person, a Jamaican, how can he make the whole country shut down? One person, how come no one in Jamaica is defending him? said a man in a group that charged the Muslim protesters. These demonstrators, they can go back home to Somalia if they want to, he told Reuters Television. During the clashes, small ambulances shuttled to and fro with sirens blaring. A helicopter clattered overhead and police used water cannon to try to clear the streets. Security forces fired AK-47 assault rifles at pockets of stone-throwing protesters, according to Reuters TV footage. One fleeing demonstrator was grabbed by police and beaten with batons and kicked on the ground. When the police moved on, a medic went to the man, bent down, closed his eyelids and carried him away. It was not clear whether the protestor was unconscious or dead. Local media gave widely differing reports of casualties, ranging from two to seven dead. Witnesses said one security officer had been wounded by a gunshot. Kenyatta National hospital said it had received six people with gunshot wounds, but they were out of danger. Kenyan intelligence officials have said they fear Faisals speeches could stoke radicalism in a country that has suffered two Al-Qaeda-linked attacks. Faisal was arrested on Dec 31 and the government now wants to send him to Jamaica. Mr Al-Faisal is a threat to this country because of his alleged tendencies to recruit suicide bombers, government spokesman Alfred Mutua told reporters after the riots.