Four Palestinians were killed and at least 18 wounded in a violent feud between rival clans in the Gaza Strip.
A Hamas security force commander was shot to death Saturday in the early morning hours in the Khan Yunis refugee camp.
The Hamas military wing accused a rival clan in the Gaza Strip of ties to the killing.
The attack triggered a gunbattle that killed two members of the rival Fatah family and one bystander.
News reports say both factions say the killing was motivated by a family feud, and was not connected to the power struggle between President Mahmoud Abbas' Fatah faction and the ruling Hamas party.
The Hamas-led government condemned the violence, saying the Palestinian government is committed to a power-sharing agreement reached with the Fatah faction of President Mahmoud Abbas ealier this month.
Palestinian leaders are currently lobbying European countries to promote the unity government and end international sanctions.
Some information for this report was provided by AFP, AP and Reuters.