Rioters in the Kenyan port city, Mombasa, are taking to the streets for a second day Tuesday to protest the killing of a radical Muslim cleric.

Groups of stone-throwing youths clashed with police, who used tear gas to disperse the crowds in the city's central business district. Some shops were closed because of the unrest.

On Monday, Mombasa police told VOA that at least two people were killed as protesters battled police, burned several churches and blocked off major streets in the popular tourist town.

The protesters are demonstrating against the death of Aboud Rogo Mohammed. Witnesses say unidentified gunmen shot and killed the cleric Monday as he drove a van carrying family members.

Aboud Rogo Mohammed was placed on a U.S. sanctions list last month for allegedly recruiting fighters and raising money for Somali insurgent group al-Shabab.

The United Nations Security Council placed its own travel ban and assets-freeze on the cleric, saying he used an extremist group, Al Hijra, as a way of recruiting Swahili-speaking Africans to fight in Somalia.

In a statement Tuesday, al-Shabab calls on Kenyan Muslims to “take all necessary measures to protect their religion” from what it says were the “enemies of Islam.”

Al-Shabab is fighting to overthrow Somalia's U.N.-backed government. The militant group is known to have supporters in Kenya, which has a large Somali immigrant community.

Kenyan forces entered Somalia last October to fight al-Shabab and have since joined the African Union peacekeeping force in the country.