MOGADISHU, Jan 15 (Reuters) - Somali gunmen attacked a convoy of Ethiopian soldiers in Mogadishu late on Sunday, and fighting ensued for half an hour, a Somali government source said on Monday. "An Ethiopian convoy was hit near Arafat hospital. One of their trucks was hit and burnt," the source said referring to a hospital in a northern Mogadishu neighbourhood where government and Ethiopian troops had searched houses for weapons on Sunday. "Thirty minutes of heavy fighting followed. There are deaths on both sides but I don't have numbers."