Six Lebanese soldiers have been killed by an explosion in a building booby trapped by Fatah al-Islam fighters at a Palestinian camp in north Lebanon.
Security sources said four more soldiers were wounded by the blast, which destroyed the building at the Nahr al-Bared camp, where the army has been fighting the group for nearly four weeks.
The fighting is Lebanon's worst internal violence since the 1975-1990 civil war, killing at least 150 people.
The violence has forced thousands of people to flee the camp.
More fighting
Shell explosions and sporadic bursts of machinegun fire were heard at the camp on Friday.
The army has been fighting in the outskirts of the camp but has not entered its official boundaries.
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Lebanese security forces are not allowed to enter the 12 Palestinian camps in Lebanon under a 1969 Arab agreement.
The Lebanese army wants the fighters to surrender unconditionally and face justice for attacking and killing its troops.
Fatah al-Islam says it is fighting in self-defence and has vowed to fight to the death.
Mainstream Palestinian factions have proposed deploying a force of some 150 fighters to secure part of the camp not held by Fatah al-Islam and create a "safe haven" for refugees still there, Palestinian political sources said.
They said they were still waiting for the army's response to the idea.
Most of the camp's 40,000 residents fled to the nearby Beddawi camp in the early days of the fighting, which erupted on May 20.
King Abdullah of Saudi Arabia donated $10 million to be distributed to Palestinian families hit by the conflict, Fuad Siniora, the Lebanese prime minister, said.