Several people were killed over the weekend in Gaza City after violent clashes between Hamas security forces and a pro-Israel armed clan, multiple sources said Monday.

Skirmishes first broke out last week between the Palestinian resistance group and the Doghmush clan after a cease-fire between Israel and Hamas came into effect.

On Sunday evening, gunfights took place in the Sabra neighbourhood of Gaza City, according to witnesses who spoke with AFP on condition of anonymity, citing fears for their safety.

"About 200 members of the (Hamas) security forces were present and fought until they completely subdued" the clan members, a local resident said.

"There were dead and wounded among the (Doghmush) family members, but also martyrs and injured among the security forces," he added.

Another neighbor gave a similar account, saying calm returned to the neighborhood only around 9:30 p.m. (1830 GMT).

A source within Gaza's Hamas-run Interior Ministry acknowledged that there had been fatalities on both sides.

Accusing the Doghmush clan of being affiliated with Israeli forces and of having carried out several murders, the ministry source said around sixty members of the family had been arrested.

The family denied any collaboration with Israel, but admitted in a statement that some of its members had committed "transgressions," without further detail.

On Sunday, Gaza's interior ministry announced the opening of a "general amnesty period" for "members of criminal gangs" who had not committed murders during the war.

Since the cease-fire came into effect on Friday, AFP reporters have observed Hamas security forces deploying in several urban areas, markets and along roads across the Gaza Strip.