Five people were killed and 69 wounded in a grenade attack at a bus station in central Nairobi, the Kenya Red Cross said on Sunday. A grenade was reportedly tossed from a passing vehicle into the Machakos bus terminal near the central business district early Saturday evening, Reuters said. No group has claimed responsibility. Police blamed al Shabaab, the Somali militant group linked to Al-Qaeda. The group had pledged to carry out attacks in Kenya until it pulls its soldiers out of Somalia.