The son of a Kenyan government official was one of the masked gunmen who killed nearly 150 people at a university last week, the interior ministry said, as Kenyan churches hired armed guards to protect their Easter congregations.

The son of a Kenyan government official has been identified as one of the gunmen who took part in an Islamic extremist attack on a university that killed 148 people.

At least three people have been killed in a grenade blast in Kenya.