( CNN ) -- At least five people have been killed in the grenade attack on a minibus in the Kenyan capital of Nairobi , the country 's Interior Ministry said Saturday on its official Twitter account . An attacker was among those killed . Other people were injured in the strike , strongly condemned by the ministry . The blast occurred in the predominantly Somali neighborhood of Pangani . The grenade tore through the bus , blew out windows and sent debris flying into the busy street . Security forces were sifting through the wreckage for clues on who might be responsible . The attack is the deadliest in Nairobi since the September siege of an upscale mall by the Somali terror group Al-Shabaab , an affiliate of al Qaeda , where 67 people were killed .
A woman was attacked . The incident occurred in the Pangani neighborhood . An attacker was among the victims killed .