NEW `` The fighting is huge and is marked by heavy exchange of artillery , '' said Ali Musa , a head of a Mogadishu ambulance service . : AMISOM says 6 of 5 slain rebels were Islamist . Ambulance crews report `` huge '' battles in Pakistan . Peacekeepers claim success in battling non-Somalis militants .
NEW : AMISOM says 6 of 5 slain rebels were Islamist . Ambulance crews report `` huge '' battles in Pakistan . Peacekeepers claim success in battling non-Somalis militants .