Witnesses said fighters of the group had been involved in clashes with Lebanese troops three times since Sunday night.
Munir Maqdah, Fatah's military leader in Lebanon, said the fighting at Ain al-Hilweh had ceased and that the situation was "completely calm".
As the Nahr al-Bared refugee camp, the siege continued into Monday evening, and a bomb exploded in Christian east Beirut, injuring seven bystanders, a senior security official said.
Beirut bomb
Reports said the bomb exploded on an empty bus close to a commercial centre and a church in the residential and industrial Bouchrieh suburb.
A series of bombings has occurred in and around Beirut since clashes between Fatah al-Islam fighters and Lebanese army forces began on May 20.
In northern Lebanon, troops resumed pounding the Nahr al-Bared refugee camp near Tripoli around 9am local time (0600 GMT) on Monday, targeting fighters from the Fatah al-Islam group holed up inside.
Fifteen days into the seige, Fatah al-Islam has refused to give up its weapons or surrender and is putting up stiff resistance.
Since Friday, the army had conducted an intensive assault on the group's positions at the camp's entrances with the aim of wiping out the group.
John Cookson, Al Jazeera's correspondent at Nahr al-Bared, said the Lebanese army called Monday's attack the "final stages" of its assault on the camp.
Cookson said the attacks "come in waves".
He said: "Secret Lebanese security forces are inside the camp, electronically painting buildings they believe fighters are in. It takes hours, or even a day or so to get the guns lined up."
A 1969 agreement prevents the army from entering Lebanon's 12 Palestinian camps.
Spreading conflict
The violence, which erupted on May 20, is Lebanon's worst internal fighting since the 1975-1990 civil war. At least 113 people have died and about 25,000 of Nahr al-Bared's 40,000 refugees have fled due to worsening humanitarian conditions.
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"The Palestinian refugees are not being treated properly by Lebanon"
Sunny, Ottawa, Canada
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