Two Palestinians were killed and 11 others injured Sunday afternoon in fresh clashes between Hamas and Fatah factions in several parts of Gaza Strip, raising to four the number of people killed.

The clashes renewed in the afternoon as both sides traded accusations over the responsibility on the clashes that erupted after the killing of a senior Fatah military figure in northern Gaza Strip.

Witnesses said that a group of Hamas members attacked security forces loyal to Fatah around the house of President Mahmoud Abbas in southwestern Gaza City.

The identities of the two slain who were killed around Abbas' house were undisclosed immediately.

Meanwhile, two other Palestinians were wounded in northern Gaza Strip after unknown assailants opened fire on funeral ceremony of Bahaa Abu Jarad, the senior Fatah commander killed earlier on Sunday.

Abu Jarad and another Fatah member were shot dead in Gaza by unknown assailants which Fatah blamed on gunmen from the rival Islamic Resistance Movement (Hamas).

Witnesses said the gunmen opened fire at the car of Bahaa AbuJarad, a senior Fatah militant, in northern Gaza Strip town of Beit Lahiya.

Abu Jarad died after arriving at the hospital and one of his colleagues accompanying him when the shooting took place was also dead, a hospital official said.

It is the bloodiest incident since the two movements formed a national unity government on March 18.

For their part, Hamas has denied any relation for its members in today's killings of Abu Jarad and one of his men. "We were expecting our Fatah brothers to be accurate before distributing the accusations and blame innocent people on the events," said Hamas spokesman Ayman Taha in a statement sent to the press.

The statement added that Abu Jarad's colleague, who Fatah said he was one of its members, "was in fact a man close to Hamas and was killed by Abu Jarad's brother as a retaliatory action."