An official with the U.S. Office of the Director of Intelligence told reporters Tuesday that the office has updated its assessment of last week's explosion of al-Ahli Hospital in Gaza, which killed hundreds, and stated "with high confidence that Israel was not responsible for the explosion."

The official added, "We assess with low confidence that Palestine Islamic Jihad, PIJ, was responsible for launching the rocket that landed on the hospital,” the official added, noting that they suspect based on their analysis that the rocket responsible likely suffered a "catastrophic motor failure."

The intelligence official said they were drawing on “intelligence, missile activity, open-source video and images of the incident,” including an examination of the blast effects.

"If an Israeli munition was responsible for this blast, we would expect that Palestinian militants would be very directly and clearly showing what they thought was an Israeli munition," the official said. "We've looked at all of the images and in none of them do we assess that there are remnants, Israeli munitions."

-ABC News' Cindy Smith

Talks are ongoing between the U.S. and regional partners, including Israel, Egypt, and Qatar to secure the release of a large number of hostages being held by Hamas in Gaza, a source with knowledge told ABC News.

The U.S. is still advising for a delay to have more time for the hostages to be released and for aid to get out, but does not want to appear to be dictating what to do to the Israelis, according to the source.

-ABC News' Selina Wang

Secretary of State Antony Blinken said Tuesday that 33 Americans were confirmed dead after the Hamas terror attack on Israel on Oct. 7.

-ABC News' Shannon Crawford

With Israel appearing to be on the cusp of a ground invasion into Gaza, President Joe Biden and other world leaders this week said the Jewish state has the right to defend itself against the recent brutal attacks by Hamas.

At the same time, they warned, Israel must abide by the "law of war" in protecting innocent Palestinians living in Gaza.

But with the prospect of hundreds, if not thousands more Palestinian civilians killed, can Israel do both? And could either Israel or Hamas be prosecuted for war crimes?

Click here to read what you need to know about international humanitarian laws and how they apply in the Israeli-Hamas conflict in Gaza.

-ABC News' Anne Flaherty

In just two weeks, the space below Jerusalem's Hadassah Hospital has been converted into an underground hospital, bracing for an influx of war casualties.

Rows of hospital beds and medical equipment have been set up in what was meant to be used as a parking garage.

"We have up to 130 beds here, including intensive care beds," Dr. Tamar Elram, director of the Hadassha Mount Scopus Hospital, told ABC News. "Everything that we do here is in total cooperation and agreement with the army and with police and all the other security forces."

The hospital has also been treating civilian victims, like Michal Alon, who was shot in the hand and chest by Hamas militants on Oct. 7 and is now embarking on the long road to recovery, both physically and emotionally.

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Israeli hospital prepares for war casualties

"We've already got soldiers and civilians who are turning to our ERs, two and a half weeks after the terror attack, starting to suffer from acute post-traumatic syndrome," Elram said.

Elram says one of the biggest challenges they've faced in preparing for what's to come includes manpower. Some staffers are leaving the hospital to go serve in the Israeli military.

-ABC News' Guy Davies and Ines De La Cuetara