Lebanese troops killed seven militants, most of them foreigners, in a raid on their hideout in the northern city of Tripoli on Sunday, while sporadic battles shook a nearby Palestinian refugee camp.

The death toll for the fighting on Sunday reached twelve.

Security sources said one Lebanese soldier was killed and 14 were wounded during the 10-hour siege of an apartment building.

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The militants killed a policeman, his two daughters, aged 4 and 8, and his father-in-law after using them as human shields in an apartment, sparking the siege.

A police statement said the policeman and his daughters were visiting the father-in-law who lived in the building when the militants stormed their flat and seized them, then later killed them.

The army said it had found weapons, ammunition and electronic booby trap equipment in the apartment.

Information from a captured Fatah al-Islam member led the army to the apartment where the shootout erupted.

The dead militants, who included a Lebanese woman, were not members of Fatah al-Islam, which has been fighting an army assault on its stronghold in the Nahr al-Bared camp north of Tripoli for the past five weeks, security sources said.

The violence in the north has complicated a political crisis that pits Lebanon's Western-backed government against opponents led by the pro-Syrian Shi'ite Hezbollah and Amal factions.

Fatah al-Islam, a new group on Lebanon's tangled political scene, split from a pro-Syrian Palestinian faction last year with some 200 fighters. Since then it has drawn scores of Arab jihadis, including Iraq war veterans, to its Nahr al-Bared base.

Before Sunday's Tripoli raid, security sources had said the group was pursuing a bizarre plan to set up an Islamic emirate in north Lebanon and invite mujahideen from round the world to join it in fighting "Jews, crusaders (Westerners) and infidels".

Fatah al-Islam leaders deny direct links to al-Qaida, but say they sympathise with it. The militants killed in the Tripoli hideout were suspected of belonging to a group with closer ties to Osama bin Laden's network, the security sources said.

A similar raid on a Tripoli flat on May 20 sparked the fighting in Nahr al-Bared, where 176 people have been killed in Lebanon's worst internal violence since the 1975-90 civil war.

Witnesses said army shells crashed into the camp on Sunday as the conflict entered a sixth week. Clashes later subsided.

The militants retreated inside the camp last week after the army captured all its strongpoints nearby. Lebanon's defence minister declared an end to major combat on Thursday, but said the army would besiege the camp until the militants surrendered.

Security forces are barred from entering Lebanon's 12 Palestinian refugee camps by a 1969 Arab agreement.

The government says Fatah al-Islam is a tool Syria is using to destabilise Lebanon to try to regain hegemony there. Damascus denies this and says such groups threaten its own security.

Whether Fatah al-Islam has foreign sponsors or not, its fighters are well-armed, skilled and willing to die in what they see as a jihad, but have little Lebanese or Palestinian support.

Many Sunni Islamist groups have disowned them, while the army has gained stature as a national symbol in divided Lebanon.

"To all Islamists who have legitimised aiming the rifle at the chests of their compatriots, I tell you ... this has nothing to do with Islam. It is strife," Fathi Yakan, a Sunni Islamist leader who is close to Syria, said in an appeal on Sunday.