At least five people were killed when a grenade ripped through a minibus in Nairobi's Somali-dominated Eastleigh neighbourhood on Sunday, a Reuters witness and police said.
"I saw bodies ripped apart," the Reuters photographer said.
The force of the explosion tore apart the vehicle's roof and seats and shattered the window of a nearby cafe.
Two other cars were damaged, the photographer said.
Kenya has suffered a string of deadly attacks in its capital Nairobi, the southern port city of Mombasa as well as the eastern garrison town of Garissa over the past year.
A suspected grenade attack on a church in the eastern Kenyan town of Garissa has killed one and injured at least 11 people, say the Kenya Red Cross.
Three of the 11 injured people at Garissa's district hospital needed to be evacuated by air and the hospital urgently needed blood, said the organisation.
A Second World War grenade was brought to a police station in Alton, Hampshire. Hampshire Police said that they had to call in the Army for support after the device was taken in by a member of the public.
The grenade, which contained explosive material, was safely removed.