The U.S. and U.N. have denounced the fighting between Israel and Hamas, which resumed shortly after the three-day cease-fire ended on Friday.

Josh Earnest, White House spokesman, said Hamas' decision to restart attacks in the region would not only put civilians from Israel and Gaza at risk but would "do nothing to meet the expectations of the Palestinian people."

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He called for both sides to work on a sustainable ceasefire.

U.N. Secretary General Ban Ki Moon also criticized the renewed violence in Gaza, calling the civilian casualties intolerable.

From early July when the conflict in Gaza began, the UN has reported more than 1,900 Palestinian deaths, those of which include about 1,400 civilians including 448 children.

The Israeli death toll has reached 67 including 3 civilians, the report added.

The Israel Defense Forces (IDF) renewed its offensive with gunboats, tanks and aircraft in response to what Israel said was rocket fire from Hamas.

The IDF said they launched missiles in 33 targeted areas in Gaza early Saturday while five missiles had hit areas in Israel's southern region.

Gaza officials reported five casualties from the rocket fire, adding that three bodies had to be pulled from under a wrecked mosque.

On Friday, five people - including a 12-year-old boy - were also killed after Israel launched an offensive in Gaza. Two Israelis were reportedly injured from gunfire, BBC reported.

Mustafa Barghouti, a senior Palestinian official, told media on Friday the rocket fire in Israel was not instigated by Hamas but by other Palestinian blocs.

Still, Israel's forces claimed that Palestinian militants had fired over 70 rockets into Israel since the truce ended at 8:00 local time (5:00 GMT).

While renewed fighting continues in the region, Palestinian groups said they were willing to resume peace talks as a delegation arrived in Cairo late Friday. But Israel refused to participate in the talks, claiming that they would not "negotiate under fire."

The three-day cease-fire was a result of indirect talks in Cairo after both sides had failed to agree on a long-term truce.

Hamas is negotiating for Israel's lifting of a blockade on Gaza, dismissing Israel's call for the demilitarization in the region.

The group is also calling for the release of some 100 people who were released in a prisoner exchange agreement in 2011 but were re-arrested soon after the Gaza conflict began.

TagsGaza, Hamas, Palestine, Israel, Gaza Ceasfire, negotiations for ceasefire, US, Josh Earnest, UN, Ban Ki Moon, Mustafa Barghouti