Kenya's task force said on Wednesday they are investigating the murder of controversial Muslim cleric Aboud Rogo whose massacre sparked 3-days of violent riots in the coastal city that foreigners had a hand in his killing.

Chairman of the Commission Jacob Ondari said two key witnesses have described three unknown gunmen, of Arab Origin to be behind Rogo killing in Coastal city of Mombasa.

"We have gathered crucial evidence which points at three foreigners in a white unmarked Subaru car who sprayed bullets at the cleric along the Mombasa-Malindi highway," Ondari told journalists in Mombasa.

He said one of the foreigners was a driver and the two were seated in back seat who shot Rogo at close range after they trailed him from his home in Kikambala.

His killing on Aug. 27 sparked riots in the Coastal city, leading to the death of at least five people including four Kenya police officers and massive destruction of properties and churches. At least eight churches were burned during violent demonstrations.

Vandalism and looting by demonstrators resulted in extensive damage and immense loss of property at several churches and mosques in the coastal city.

The religious leaders said then that these attacks were indicative of a deep seated hatred towards the churches whose cause is inexplicable.

Rogo was accused by the US and the United Nations of supporting al-Qaida-linked militants in Somalia forcing the UN Security Council to impose a travel ban and asset freeze on him.

Ondari said the two key witnesses testified before the commission described the foreigners who are yet to be positively identified.

"We are appealing to public to volunteer information that will assist us arrest the perpetrators of his murder. The information will be treated with confidence," he assured the public.

The task force announced that they have recorded 27 statements from 13 witnesses but cannot pinpoint who exactly was behind his killing.

"We are appealing to the public to assist in identifying these three gunmen. We have done our part, gathered as much evidence as possible," said Ondari.

Speaking to Xinhua in Mombasa, Ondari said the 16 spent cartridges collected from the scene of crime did not match those used by Kenya police. He said the policemen use copper bullets, which are different from ammunition whose cartridges were found at the scene.

Rogo was killed in a hail of bullets fired by gunmen in Mombasa as he drove his wife to hospital.

His wife and father-in-law, Abdalla Ali, and her five year-old daughter who was with them in the car, were injured, but their daughter escaped unhurt. The task force is also investigating leads if the three gunmen were hired by Kenya government, foreign countries or were his rivals.

According to a senior police officer, infighting for leadership of the Al-Shabaab terror group, which enjoys funding from the Al- Qaida terror network, could have been behind the killing.

"The essence of this team is to gather enough information as possible so that those people who knew or were never informed to get opportunity to share their evidence," Ondari said.

The team further told the media in the coastal city that the family of Rogo did not point finger to Kenya police.

"The family has been cooperative even the wife who was in the van during the incidents said she did not see the assailants," Ondari said.