Ten people have been killed and 40 wounded in simultaneous attacks on two churches in north-eastern Kenya near the Somali border, according to a police official.

Police commander Philip Ndolo said gunmen threw grenades during the attacks on Sunday.

The bloodiest attack was on the African Inland church in Garissa, a town 120 miles west of the Somali border. Attackers threw two grenades inside the church, one of which exploded, Ndolo said.