Palestinian president Mahmoud Abbas has called for "an immediate end to the comprehensive aggression against the Palestinian people", his office said following a meeting with Jordan's King Abdullah II.
In his first public remarks since a massive Hamas onslaught on southern Israeli communities early Saturday that spiralled into deadly war, Mr Abbas rejected "practices related to killing civilians or abusing them on both sides", according to a statement.
The two leaders met in Amman and discussed "ways to stop the Israeli aggression against the Palestinian people and deliver aid and relief" to Hamas-controlled Gaza, the statement said.
The targeting of civilians by both Israeli forces and Palestinian militants "contravenes morals, religion and international law," Mr Abbas said.
According to the statement, he stressed Palestinians "renounce violence and adhere to international legitimacy, peaceful popular resistance, and political action as a path to achieving our national goals".
Mr Abbas also "warned of the danger of the only power plant in Gaza stopping working due to running out of fuel" and urged action to secure the supply of electricity and water as well as "opening urgent humanitarian corridors".
With dozens of Israeli civilians and security personnel believed to be held captive in Gaza and Palestinian militants captured by Israel, Mr Abbas called "for the release of civilians, prisoners and detainees".
The Palestinian Authority which Mr Abbas heads is based in the West Bank, while his Islamist rival Hamas controls Gaza.
It comes as the International Committee of the Red Cross (ICRC) has said the humanitarian situation in Gaza will become "unmanageable very quickly" if Israel cuts resources or humanitarian aid.
Israel has said there would be no humanitarian exceptions to its siege until all its hostages were freed.
The country's Energy Minister has vowed that his country would not allow basic resources or humanitarian aid into Gaza until Hamas released the people it abducted during its surprise weekend onslaught.
"Humanitarian aid to Gaza? No electric switch will be turned on, no water tap will be opened and no fuel truck will enter until the Israeli abductees are returned home," Israel Katz said in a statement.
At least 150 people - including soldiers, civilians, children and women - have been held hostage in Gaza since Hamas's Saturday attack on Israel.
Israel has in turn launched a withering air campaign against Hamas militants in the blockaded enclave, killing around 1,200 people.
In recent days Israel announced a "complete seige" on Gaza, cutting off water, fuel and electricity supplies.
Meanwhile the head of the Israeli military, Lt General Herzi Halevi, has said that lessons would be drawn from the security failures around Gaza that enabled the attack.
"The IDF is responsible for defending the country and its citizens, and Saturday morning, in the area around Gaza, we did not live up to it," he said.
"We will learn, investigate, but now is the time for war."
The Palestinian territory's sole power plant shut down yesterday after running out of fuel.
The ICRC has said that they will not be able to maintain the civilian population in Gaza for very long with the supplies they currently have.
"Our understanding is that there is still fuel - but probably only for a few hours - to allow generators to work, including in hospitals," Fabrizio Carboni, ICRC's regional director for the Near and Middle East, told reporters.
"As Gaza loses power, hospitals lose power, putting newborns in incubators and elderly patients on oxygen at risk. Kidney dialysis stops, and X-rays can't be taken. Without electricity, hospitals risk turning into morgue," he said.
Mr Carboni said it was crucial to allow humanitarian aid already inside Gaza to be safely distributed. He said the enclave's dwindling supplies could not maintain the civilian population for very long.
The ICRC has said it is in contact with Hamas and Israel to try to negotiate the release of hostages taken into Gaza, the group has said.
"As a neutral intermediary we stand ready to conduct humanitarian visits; facilitate communication between hostages and family members; and to facilitate any eventual release," Mr Carboni said in an earlier statement.
Hostage-taking is forbidden under international humanitarian law, and anyone detained must be released immediately, Mr Carboni added.
The ICRC urged "both sides to reduce the suffering of civilians".
In retaliation for Saturday's attack, Israel has relentlessly pounded Gaza and imposed a complete siege on the impoverished territory of over two million people, cutting off water, electricity and fuel supplies.
Hamas has claimed that four of the captives died in Israeli strikes and threatened to kill others if civilian targets are bombed without advance warning.
Turkish President Recep Tayyip Erdogan has also started negotiations with Hamas for the release of the hostages, an official source told AFP late yesterday.
Read more:
Biden warns Iran over Gaza as Israel forms war cabinet
President leads tributes paid to Irish-Israeli woman Kim Damti
The war has already claimed almost 3,000 lives on both sides since Saturday.
More than 338,000 people have been forced to flee their homes in Gaza, according to the UN, while the EU has called for a "humanitarian corridor" to allow civilians to flee the enclave's fifth war in 15 years.
In Israeli-annexed east Jerusalem today, two officers were wounded in a shooting, police said, adding that the gunman was "neutralised".
One of the officers was in serious condition and the other was lightly wounded, police said citing medics.
Airports in Syria 'hit by Israeli missiles'
Syrian officials have said Israeli forces have launched simultaneous missile attacks on the airports in its capital Damascus and the northern city of Aleppo, damaging the runways and putting both hubs out of service.
A Syrian military source cited by state news agency SANA said "bursts of missiles" hit the two airports at the same time, in what he said was a bid to distract the world's attention from Israel's war with Hamas militants in Gaza.
The Israeli military said it does not comment on such reports.
Israel has for years carried out strikes against what it has described as Iran-linked targets in Syria, including against the Aleppo and Damascus airports.
Sources have said strikes on the airports are intended to disrupt Iranian supply lines to Syria, where Tehran's influence has grown since it began supporting President Bashar al-Assad in the civil war that started in 2011.
Today's strikes came a day before Iran's foreign minister, Hossein Amir-Abdollahian, was due to visit Syria.
Israel has vowed to annihilate the Hamas movement that rules Gaza, in retribution for the deadliest attack on civilians in its history when hundreds of gunmen crossed the barrier and rampaged through Israeli towns on Saturday.
Tehran has celebrated the Hamas attacks but denied being behind them.
On Tuesday, Israeli troops fired artillery and mortar shells towards Syria after rockets from southern Syria hit Israeli positions across the border.
