Israel-Gaza updates: Biden speaks with Netanyahu about hostages' release, Gaza humanitarian assistance

Palestinian Authority President Mahmoud Abbas blamed Israel for the attack on the Gaza hospital that has left over 500 people dead.

Abbas called for "unity" for all Palestinians in a speech delivered early Wednesday morning local time.

"Nobody will use division but the enemy of the Palestinian people," he said.

Abbas claimed the world was "silent" and called on the U.S. Security Council and others to condemn the attack.

"We warn the international community of the crimes of the Israeli occupations. [and] in this tough moment, to make the Israeli accountable and to protect the Palestinian people," he said.

4:11

Strike on Gaza hospital kills at least 500 people: Gaza Health Ministry The Israel Defense Forces denied responsibility for the attack, saying a failed launch by the Palestinian Islamic Jihad caused the blast.

ABCNews.com

A spokesperson for the Israel Defense Forces claimed during a news conference they have evidence they were not responsible for the strike on a hospital in the Gaza Strip on Tuesday.

Daniel Magari told reporters that the IDF plans to release evidence showing Israeli forces were not responsible for the attack.

Magari claimed there were no IDF air strikes next to the hospital. He added there was an "air force event" but it used a different kind of ammunition.

"We don't have any indication that it hit the hospital, but it does not fit the footage that we have in the hospital," he said.

-ABC News' Ellie Kaufman

President Joe Biden departed via Air Force One at 5:55 p.m. ET for his trip to Israel.

The president is expected to arrive early Wednesday morning and meet with Israeli leaders about the ongoing conflict.

A planned meeting in Jordan with King Abdullah II, Egyptian President Abdel Fattah el-Sissi and Palestinian President Mahmoud Abbas has been canceled, according to a U.S. official, who added it was a "mutual decision."

"The president sent his deepest condolences for the innocent lives lost in the hospital explosion in Gaza, and wished a speedy recovery to the wounded. He looks forward to consulting in person with these leaders soon, and agreed to remain regularly and directly engaged with each of them over the coming days," a White House official said.

-ABC News' Mary Bruce

President Joe Biden has departed the White House and is en route to Joint Base Andrews where he will depart for Israel.

He is expected to meet with Israeli officials on Wednesday.

-ABC News' Mary Bruce