Hamas has accused the Israeli military of arresting the director of Al-Shifa Hospital, the largest medical complex in the Gaza Strip, along with several other staff members "who remained at the facility to help patients and wounded evacuate."

"We see this move by Israel as nothing less than despicable, lacking any sense of humanity and morals," Hamas said in a statement on Thursday morning. "It is also a flagrant violation of international norms and charters, given obligations to ensure that medical personnel are never harmed, including in times of war."

Hamas noted that Al-Shifa Hospital's director, Dr. Muhammad Abu Salamiya, was in contact with International Committee of the Red Cross and the World Health Organization "to evacuate the remaining patients and wounded." The militant group, which rules Gaza, called on the ICRC, the WHO and other international bodies "to exert pressure on the Israeli occupation army to secure his release, along with the medical personnel who were arrested simply for continuing to fulfil their humanitarian duty."

In a separate statement on Thursday, Gaza's Hamas-run Ministry of Health said the arrests occurred Wednesday as the United Nations and its health arm, the WHO, led a convoy of evacuated patients and medical staff from Al-Shifa Hospital. Israeli soldiers "stopped the convoy at a checkpoint separating the northern and southern Gaza Strip for seven hours" before arresting the hospital director and other staff members, according to the health ministry.

"The [Israeli] occupation bears full responsibility for the lives and safety of detained colleagues," the ministry added. "The United Nations bears full responsibility for what happened, and we await measures on their part to address this. We decided to stop coordination with the World Health Organization until a report on what happened was submitted and all detainees were released."

There was no immediate confirmation of the event or comment from the U.N. or the WHO.

There was also no immediate confirmation of the arrests or comment from the Israel Defense Forces, which has been conducting a ground raid of Al-Shifa Hospital in Gaza City for days.

The IDF alleges that Hamas has placed its command centers under Al-Shifa and other hospitals in Gaza and is deliberately sheltering behind Palestinian civilians -- claims that the militant group denies.

-ABC News' Nasser Atta and Morgan Winsor

The Israel Defense Forces said Thursday morning that it has carried out airstrikes on more than "300 Hamas terror targets" in the Gaza Strip over the past day.

The targets that were struck included Hamas "military command centers, underground terror tunnels, weapon storage facilities, weapon manufacturing sites, and anti-tank missile launch posts," according to a statement from the IDF.

-ABC News' Jordana Miller and Morgan Winsor

The Qatari Ministry of Foreign Affairs spokesperson, Dr. Majed bin Mohammed Al Ansari, announced Thursday morning that the talks between Israel and Hamas on the details of the implementation plan for the humanitarian pause deal in the Gaza Strip "are continuing and progressing positively."

"Dr. Al Ansari affirmed that the start of the pause agreed upon will be announced within the next few hours," a statement from the ministry read. "Work continues with both parties, and with our partners in the sisterly Arab Republic of Egypt and the United States in order to ensure rapid start of the pause and provide what is necessary to ensure the parties adherence to the agreement."

The temporary truce was expected to begin Thursday morning, while a prisoner swap was to start no earlier than Friday. But a senior Israeli official told ABC News late Wednesday that neither will happen before Friday.

The deal between Israel and Hamas, reached Wednesday morning, was mediated by Qatar, Egypt and the U.S.

-ABC News' Zoe Magee and Morgan Winsor

A doctor at Al-Arish Hospital in Egypt shared an update on the condition of the premature babies evacuated from Gaza earlier this week, saying about 10% of them are in "critical" condition.

"When the babies arrived at our hospital … they were facing a lot of bad conditions during transfer, taking their medical history, not accompanying families for them, so you are dealing with … very critical conditions for them," Dr. Ahmed Mahdy told ABC News Wednesday.

Sixteen premature babies were brought to Al-Arish Hospital in Egypt near the border after Al-Shifa Hospital in Gaza ran out of fuel to run their incubators and came under attack by IDF forces. Dr. Mahdy said they all had low weight when they arrived at Al-Arish, ranging from 1-2.3 kilograms (2.2 lbs – 5 lbs).

Dr. Mahdy said some of the babies "are very critical," estimating about 10% of them are in that condition. The other infants are "less critical."

One of the struggles doctors at Al-Arish Hospital have run into is that there aren't families or mothers with most of the babies to ask about their history or the mother's history during her pregnancy. Out of 16 babies, only three mothers are accompanying four babies. Still, the doctors persevere to treat the infants.

"They may be at risk, but we are doing our best for them," Dr. Mahdy said. "We are giving them the medications they need, the feeding. You know, the babies need feeding, feeding assessment and feeding progress."

The first group of Israeli hostages have been released by Hamas in the Gaza Strip and handed over to the International Committee of the Red Cross, two sources briefed on the matter told ABC News.

The sources said the Red Cross has the hostages and that the "operation" to get them home has begun.

It was expected that 13 Israeli hostages would be freed by Hamas near Gaza's border with Egypt on Friday in a prisoner exchange deal. But it was unclear exactly how many were handed over to the Red Cross.

-ABC News' Matt Gutman and Morgan Winsor