HEAVY fighting erupted on Friday in the southern Somali port city of Kismayo, militia and humanitarian sources reported. Kismayo has been controlled since 1993 by warlord Mohamed Said Hirsi “Morgan,” a Marjerten, but it was unclear by late-afternoon if he still controlled the city or if a coalition of rival Marehan and the Habr Gedir of south Mogadishu warlord Hussein Mohamed Aidid had wrested it from him. Warlords have ruled Somalia since the overthrow of dictator Mohamed Siad Barre in 1991 in a bloody civil war.