A rebel ambush on a Philippine army patrol in the south of Manila has killed 11 soldiers. <br/><br/>A military statement said a reconnaissance platoon was ambushed by about 60 guerrillas while on patrol outside Mansalay township on Mindoro island. <br/><br/>It said the troops had been sent to the area to stop communist rebels of the New People's Army extorting money from candidates ahead of May's elections. It was the army's biggest death-toll in battles with the rebels this year.<br/>