Grenade fired at Haniya's house

Gaza: Palestinian gunmen fired a rocket-propelled grenade at Prime Minister Esmail Haniya's Gaza home on Tuesday, damaging the building, but he was unharmed as factional fighting raged for a fourth day, officials said.

Haniya is a leader of the Islamist Hamas group and the clashes have cast doubt on the future of a unity coalition he forged with President Mahmoud Abbas's Fatah faction in March. Fourteen people were killed on Monday, hospital officials said.

An officer with Abbas's presidential guard said several mortar bombs struck the president's compound in Gaza City earlier on Tuesday.

In other fighting, Hamas said gunmen had killed a member of its armed wing who was a nephew of one of its late leaders, Abdel Aziz-Rantissi, after abducting him.

It also accused Fatah of abducting a doctor and threatened to execute Fatah leaders if he was killed.

Fatah had no comment on the attacks and accusations.

Fawzi Barhoum, a Hamas spokesman, accused Fatah of firing the grenade in an attempt to assassinate Haniya and vowed to punish the perpetrators. The grenade "penetrated the house and exploded", he said. The building was damaged.

"Thank God there are no injuries," said Barhoum, confirming that Haniya was inside at the time. "Hamas has decided to punish the attackers and the killers and it will not be reluctant to punish them without any mercy."

The fighting doomed an Egyptian-brokered ceasefire announced early on Monday.