Palestinian officials say Israel has carried out a new airstrike in the Gaza Strip.
The officials say Israeli aircraft fired on a metal workshop in the town of Khan Younis, wounding at least two people.
The airstrike follows two days of fighting among rival Palestinians in the West Bank and Gaza Strip.
On Monday, three people were killed and at least 20 others were wounded in gun battles between supporters of the Fatah faction and the ruling Islamic group Hamas.
On Sunday, violence between rival Palestinian factions killed at least eight people.
Palestinian leaders have appealed for calm.
But Reuters reports that the al-Aqsa Martyrs Brigades, in a statement sent to the agency, is threatening to kill three Hamas leaders including the exiled political chief Khaled Meshaal.
The Al-Aqsa Martyrs Brigades is an armed wing of the Fatah faction of Palestinian President Mahmoud Abbas.
The fighting between Palestinian factions began Sunday when militia loyal to the ruling Hamas group confronted pro-Fatah civil servants protesting about unpaid wages.
The Palestinian Authority has been unable to pay the salaries of more than 160,000 civil servants since March, when Europe and the U.S. suspended aid payments after Hamas took power.
Negotiations between Hamas and Fatah to form a unity government have stalled.
Israel launched an offensive in the Gaza Strip in June after Palestinian militants kidnapped an Israeli soldier.
More than 200 Palestinians have been killed during the offensive.
Some information for this report was provided by AFP, AP and Reuters.
