Kenyan authorities say a hand grenade has ripped through a church in the capital, Nairobi, killing one child and wounding three others.

Police say the attack appeared to target a Sunday school class for children.

There has been no claim of responsibility for Sunday's attack on the St. Polycarp church on the outskirts of Nairobi. However, authorities suspect the Somali militant group al-Shabab.

Kenya has seen a series of similar deadly attacks on churches since the country sent troops into neighboring Somalia last year along with African Union forces to fight al-Shabab.

The group, linked to al-Qaida, abandoned its last stronghold in Somalia on Saturday, vowing to retaliate against Kenyan and AU forces.