Palestinians and Lebanese militants have fought with rifles and rocket-propelled grenades in Lebanon's largest refugee camp, leaving two men dead and nine wounded.
In the heaviest clash in Ein el-Hilweh camp in 10 years, Islamic militants attacked a post of the Palestinian Armed Struggle.
The group is linked to Palestinian leader Yasser Arafat's Fatah faction and supervises camp security.
The shoot-out lasted about 45 minutes, Lebanese and Palestinian officials said.
A Fatah official, Maher Shabaytiyeh, said the attackers belonged to the Palestinian faction Asbat al-Ansar and a group of Lebanese militants hiding in the camp.
The Lebanese militants had fled to Ein el-Hilweh, which is outside the southern port of Sidon, after a clash with the national army in the northern region of Dinniyah more than two years ago.
"There is general consensus among Palestinians that they should be arrested and handed over (to Lebanese authorities) today rather than tomorrow," the head of Fatah in the camp, Khaled Aref, said of the Dinniyah militants.
One militant, Abu Ramiz, said he and his colleagues would not surrender to authorities under any circumstances.
A Palestinian from Armed Struggle and a Lebanese militant were killed, said Lebanese security officials. Eight men from Armed Struggle and Fatah and a Palestinian man selling coffee were wounded, the officials said.
Ein el-Hilweh is Lebanon's largest Palestinian refugee camp and home to about 75,000 Palestinian refugees and descendants. It is off-limits to Lebanese authorities and run by various Palestinian factions who frequently reach for their weapons to settle differences.
PA