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.