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."

Hamas announced that it will be delaying the release of Israeli hostages, accusing Israel of violating the cease-fire agreement regarding aid trucks and the agreed-upon terms for the release of Palestinians imprisoned in Israel.

The Al-Qassam Brigades -- the armed wing of Hamas -- said it had decided to delay Saturday's scheduled second round of hostage releases until Israel committed to allowing aid trucks to enter northern Gaza. Hamas was expected to release 13 Israeli hostages in exchange for the release of 39 Palestinians imprisoned in Israel on Saturday, sources told ABC News.

"The Al-Qassam Brigades decides to delay the release of the second batch of hostages until the occupation adheres to the terms of the agreement regarding the entry of relief trucks into the northern Gaza Strip, and due to its failure to adhere to the agreed-upon criteria for releasing prisoners," Al-Qassam Brigades said in a statement.

Hamas leader Osama Hamdan, who is based in Lebanon, said relief trucks that arrived in northern Gaza today were half of the number that was agreed upon.

"There are violations committed by the Israelis in implementing the terms of the truce, some of which occurred yesterday and were repeated today," Hamdan said Saturday, adding that another issue at stake was the reported shooting of two Palestinians on Friday as they tried to reach northern Gaza.

A senior Israeli political source told ABC News that Israel did not violate the agreement. The IDF said about 200 trucks carrying humanitarian aid are expected to enter Gaza today, after 200 trucks with aid entered Gaza yesterday via the Rafah crossing and delivered their cargo to international aid organizations.

The Palestinian Red Crescent said 61 trucks carrying food, water and medical supplies headed to northern Gaza on Saturday, the largest aid convoy to reach the area since the start of the war.

-ABC News' Ayat Al-Tawy, Nasser Atta, Jordana Miller