Israeli Prime Minister Benjamin Netanyahu on Sunday accused the Islamist Hamas movement of kidnapping three teenagers as a massive West Bank manhunt for the missing youths entered its third day.

As troops wrapped up the biggest arrest operation in years, detaining 80 Palestinians overnight -- many of them Hamas members -- Netanyahu pointed the finger of blame directly at the Islamist movement.

A seven-year-old Gaza boy wounded in an Israeli air raid on the northern Gaza Strip died on Saturday, a spokesman for the Palestinian health services said.

Ali al-Awour was wounded in Wednesday's strike targeting his uncle, radical Salafist Mohammed al-Awour, who was killed. Another Palestinian man was wounded.

Qatar is stepping in temporarily to help the new Palestinian unity government pay former employees of Islamist movement Hamas' disbanded Gaza government, an official said Friday.

The Gulf state said it would contribute a total of $60 million (44 million euros) while the Palestinian Authority grapples with a pay row, the first challenge for a government formed to try to end years of Palestinian rivalry.

Gaza's banks reopened Wednesday after being closed for six days by Hamas forces, an official said, in a dispute that is the first challenge to a new Palestinian unity government.

"All automatic telling machines at bank branches in the Gaza Strip are working again today," said a statement from Jihad al-Wazir, head of the Palestinian Monetary Authority, the Palestinians' central bank.

Hamas on Monday slammed the Palestinian government in a wages dispute, demanding that President Mahmud Abbas step in to ensure the Islamist movement's Gaza-based government workers were paid.

The row, the first hitch for a new unity government sworn in last week, came to a head on Thursday when Hamas government workers clashed with their Palestinian Authority-employed rivals after the latter were paid and the former were not.

A Palestinian fisherman in the Gaza Strip died on Sunday from Israeli gunshot wounds sustained last month, an official in the outgoing Hamas-run health ministry said.

"Fisherman Imad Shukri Salem, 52, died this morning from wounds he sustained two weeks ago," spokesman Ashraf al-Qudra told AFP, saying troops on a naval vessel fired at him while he was fishing.

Rocket fire from Gaza and Syria hit Israel early Monday in two separate incidents that prompted the Israeli military to hit back, just hours before the swearing in of a new Palestinian government.

The exchanges of fire took place as Palestinian president Mahmoud Abbas was to unveil a new government pieced together as part of a surprise April reconciliation agreement between leaders in the West Bank and the Hamas-run Gaza Strip, that has been fiercely opposed by Israel.

Palestinian militants in Gaza fired a rocket which struck southern Israel on Friday, without causing casualties or damage, following a weeks-long lull, the army said.

A spokeswoman told AFP it struck open ground in the Shaar Hanegev area.

Several hundred Christians from the Gaza Strip have been allowed to leave the besieged Palestinian territory to travel to the West Bank for Pope Francis's upcoming visit, officials said Thursday.

"Israel allowed around 650 Christians in Gaza to travel to the West Bank during the pope's visit" this weekend, a security official told AFP .

Exiled former Palestinian security chief Mohammed Dahlan says his conviction for defamation by a West Bank court is aimed at keeping him from running in promised presidential and parliamentary elections.

Dahlan, who lives in exile in the United Arab Emirates, was convicted in absentia by a Ramallah court in March and sentenced to two years in prison, but the ruling was only made public this week.