At least 13 people - most of them militants - have been killed in the camp since fighting broke out on Saturday between mainstream faction Fatah and hardline Islamists, security sources in the camp told Reuters.
A tenuous ceasefire has been holding after two militants were killed late Wednesday night, security sources said.
Ain el-Hilweh is the largest of 12 Palestinian camps in Lebanon, hosting around 80,000 of up to 250,000 Palestinian refugees countrywide, according to the United Nations' agency for refugees from Palestine.
Where are displaced individuals and families fleeing to?
Some of the newly displaced had fled to schools just outside the camp, according to Nabaa, a Lebanese group that supports refugees. READ MORE