A grenade attack on a church has wounded seven people, mostly police officers, in an eastern Kenyan town near the Somali border.

“Seven people have been injured after the grenade was thrown in the church” in the town of Garissa, said a police officer who spoke on condition of anonymity on Sunday.

“It ripped through the roof during a prayer session.”

The officer said the church was located inside a police camp and that most of the wounded were police officers.

Regional police chief Philip Tuimur confirmed the incident, saying: “Emergency response is under way. We have people injured.”

In July, at least 18 people were killed in attacks on two churches in the same town, which is located about 140 kilometres from the Somali border.

Kenya has seen a wave of grenade attacks on cities including the capital Nairobi and the key port of Mombasa since the country sent troops into Somalia in October last year to fight the al-Qaeda-linked Shebab insurgents.