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The slaughter of 28 people on a bus in Kenya is a bid to start a religious war, a senior adviser to President Uhuru Kenyatta has told the BBC.

Abdikadir Mohammed called on Kenyans of "all faiths and creeds" to stand together against the "heinous crimes".

At dawn on Saturday, al-Shabab gunmen attacked the bus in northern Kenya, shooting dead non-Muslim passengers.

The Somalia-based Islamist group has carried out numerous attacks across Kenya since 2011.

The bus was travelling to the capital, Nairobi, when it was stopped in Mandera county, not far from the border with Somalia.

Gunmen separated out non-Muslims by asking passengers to read from the Koran, officials and witnesses said. Those who failed were then shot in the head.

Kenya's Red Cross confirmed that 28 of the 60 passengers on the bus were killed, 19 men and nine women.

One survivor, Douglas Ochwodho, told how he was singled out to be killed but was not shot and then pretended to be dead among the bodies.

'Heinous crimes'

"The aim is to create conflict between the Muslims and the non-Muslims in this country," Mr Mohammed told the BBC. "The aim is to create a religious war, religious strife, in Kenya."

"We have had a lot of the Muslim leaders come out today [Saturday] and strongly condemn this and call on Kenyans of all faiths and creeds to stand together against these heinous crimes and criminals."

Credit: The BBC