There have been several instances of grenade attacks at bus stations and at a bar in Nairobi in recent months . NEW : At least two others are injured . Kenya : Police suspect Al - Shabaab or members of Al - Shabaab . Grenade attacks have hit Nairobi in recent months .
NEW : At least two others are injured . Kenya : Police suspect Al - Shabaab or members of Al - Shabaab . Grenade attacks have hit Nairobi in recent months .