Al-Qaida-linked insurgents fleeing Philippine troops took shelter in the camp of a Muslim separatist group that has a peace deal with the government, sparking a battle that wounded at least 13 soldiers, officials said Monday. Members of the brutal Abu Sayyaf group, target of a months-long US-backed offensive on Jolo island, tried to evade troops by entering the camp of the Moro National Liberation Front on Sunday, Marine Brig. Gen. Ben Dolorfino said. Reports from the area said six Abu Sayyaf guerrillas were killed, army spokesman Maj. Ernesto Torres Jr. said. No bodies were recovered, however.