mogadishu seven people kill car bomb explode near bus stop district somalia capital mogadishu thursday police say yet clear carry bomb islamist group al shabaab frequently carry bomb mogadishu towns seek destabilize western-allied central government count seven dead body civilians major nur hussein police officer tell reuters phone say car explode minibus carry civilians pass death toll likely rise say reuters witness scene say saw least three dead body damage minibus blood stain seven kill car bomb explosion mogadishu police