Five people have been killed in Israeli air strikes on Gaza, health officials there say, as Palestinian militants continue to fire rockets at Israel.

Violence resumed after the end of a three-day ceasefire on Friday.

Tensions have also been growing in the West Bank where protesters have clashed with Israeli troops. Reports say two Palestinians have been shot dead, one yesterday and one today.

At least 1,960 people have died since violence erupted in Gaza in early July.

More than 1,900 Palestinians, mostly civilians, have been killed, according to the UN.

Sixty-seven people have died on the Israeli side, including three civilians.

Israel said it renewed its military offensive soon after the truce lapsed in response to rocket fire by the Hamas militant group, which dominates Gaza.

On Saturday, the bodies of three Palestinians were pulled from the wreckage of a mosque in Gaza, local officials said.

Two more people died when their motorcycle was bombed, the authorities added.

There have also been two major explosions in the Gaza Harbour area. One of the blasts is believed to have targeted a Hamas training facility.

The Israel Defense Forces earlier said it had struck 33 sites in Gaza on Saturday, while six rockets had hit southern Israel.

More than 70 rockets have been fired from Gaza since the end of the ceasefire, according to the IDF.

The conflict has also caused tensions in the West Bank, the territory governed by Palestinian Authority President Mahmoud Abbas and his Fatah movement.

A Palestinian man died of a bullet wound during a confrontation with Israeli soldiers in the city of Hebron, health officials said today.

Earlier, Israeli military officials confirmed that troops had killed a Palestinian man yesterday at a protest near a Jewish settlement outside the town of Ramallah.

The US and United Nations have condemned the fresh outbreak of violence in Gaza, urging the two sides to cease hostilities.

The fighting resumed after Israeli and Palestinian representatives failed to agree a long-term truce at indirect talks in the Egyptian capital, Cairo.

Hamas said Israel had failed to meet its key demands, including the lifting of the Gazan blockade and the release of prisoners. It also rejected Israel's call for the demilitarisation of Gaza.

Meanwhile Israeli officials said they would not "negotiate under fire".

Israel launched Operation Protective Edge on 8 July with the stated aim of halting rocket fire from militants in Gaza and destroying the network of tunnels it said were used by militants to launch attacks inside Israel.

The strikes have damaged large parts of Gaza, including the only electricity plant, which was knocked out by shellfire on 29 July.

Human Rights Watch (HRW) has now warned that the plant's shutdown has worsened the humanitarian crisis for Gaza's 1.7 million residents.

"It has drastically curtailed the pumping of water to households and the treatment of sewage, [and] caused hospitals, already straining to handle the surge of war casualties, to increase their reliance on precarious generators," HRW, a New York-based group, said today.

"It has affected the food supply because the lack of power has shut off refrigerators and forced bakeries to reduce their bread production."

Israel said its forces hit the station by accident.