Foreign military planes are arriving in Lebanon with military aid for the Lebanese army to fight Islamic militants inside a Palestinian refugee camp.
US and Arab military transport supply planes landed at Beirut airport on Friday.
The United States agreed to speed up military aid after fighting erupted at the Nahr al-Bared camp near Tripoli, killing 75 people since Sunday.
Meanwhile, in an Internet posting, a group claiming to be the al-Qaida branch in the Levant, which includes Lebanon, threatened attacks if Lebanese troops do not stop operations against the Fatah al-Islam militants in the camp.
Lebanese Prime Minister Fuad Siniora has vowed to crush the militants, but a truce has largely held since Tuesday.
Hezbollah leader Sheikh Hassan Nasrallah warned on Friday the military against attacking the camp, saying the situation should be resolved through talks.
Thousands of refugees have fled the camp since the truce went into effect. Most headed to Tripoli and another nearby Palestinian refugee camp at Beddawi.
The battles on the outskirts of Tripoli are said to be the worst internal fighting since Lebanon's 15-year civil war ended in 1990.
The United States provided Lebanon with 40 million dollars in military aid last year. The Bush administration has requested an additional 280 million dollars in military aid for Lebanon this year.