Nairobi — A grenade explosion has killed at least seven people and wounded another 29 in an explosion on a minibus in Nairobi.

The blast followed several grenade attacks across Kenya blamed on Somali militants, the Kenyan Red Cross said.

The grenade was tossed onto a minibus, known as a matatu, full of passengers riding through the Eastleigh neighborhood of Nairobi.

No group has claimed responsibility for this attack. Such attacks have escalated since Kenyan forces invaded neighboring Somalia last year to battle the Islamist militant group Al-Shabaab, blaming it for kidnappings of foreigners in the nation.