COLOMBO, Sri Lanka (AP) — Sri Lankan troops closed in on separatist rebels in an ever-shrinking coastal war zone Wednesday, as two prominent guerrillas surrendered and tens of thousands of refugees clutching their belongings fled the fighting in boats. The sandy beaches north of the 5-mile-long combat zone were filled with ethnic Tamil civilians, according to photos released by the military. Mothers held infants and others carried sick relatives as they sailed to government territory with a navy escort. The fighting and the surrender of the two officials may be an indication that the guerrillas are feeling pressure from the army’s months-long offensive to end the 25-year-old conflict. The rebels had previously ignored the government’s calls to surrender.