At least two Palestinians have been killed and 20 others wounded in Gaza after Hamas fighters clashed with a clan loyal to Mahmoud Abbas, the Palestinian president and Fatah leader.
Mohammed al-Susei, a 13-year-old boy, and Mohammed Hellis, an armed member of the clan, were killed during the fighting in Gaza City, medics said on Saturday.
Among the wounded was the boy's father, sources said.
Hamas officials said the fighting began when members of the Hellis clan fired at a vehicle carrying Hamas fighters.
Ongoing fighting
Hamas security forces had demanded the clan surrender members who were involved in clashes on Wednesday in which at least three Palestinians were killed.
Mediators from other Palestinian factions said they had brokered a ceasefire agreement, but witnesses said parts of Gaza City were still closed off and that fighters were roaming the streets.
"Since last night the members of the Hellis family have shown they have no intention of implementing our agreement and have erected sand blockades, laid mines and taken up arms," said Ihad al-Ghussein, a spokesman for the Hamas's interior ministry.
Wednesday's clash was one of the biggest since Hamas took over the Gaza Strip after defeating Abbas's forces after heavy fighting in June.