Dr. Sara Al Saqqa, a surgeon at Gaza's Al-Shifa Hospital, fled the hospital complex several days ago "because everything was pretty horrific and terrifying," she told ABC News.

She said most of her colleagues and patients evacuated the hospital, where Israeli troops are carrying out a dayslong raid, but she said nearly 100 doctors remain there, along with more than 700 patients and thousands of people seeking refuge.

"The situation now is a disaster at Al-Shifa," she said. "Israeli occupational forces have invaded Shifa Hospital with their tanks and destroyed most of the medical equipment there. … They shot a lot of people and they arrested more."

The Israeli army 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.

National Security Council spokesperson John Kirby said the U.S. has intelligence that Hamas has used Gaza's hospitals, including Al-Shifa, to support its military operations and hold hostages.

The IDF's operations at the hospital are ongoing Thursday.

The Israelis said that they found explosives inside the medical complex, but Al Saqqa said the Israelis "didn't find the things that they are looking for because there is no military activity inside the hospital. And this is something that's obvious to all of us, the ones working there for several years."

The Palestinian Telecommunications Group said Thursday that "all telecom services in Gaza Strip have gone out of service as all energy sources sustaining the network have been depleted, and fuel was not allowed in."

The Israel Defense Forces said Thursday that its "soldiers struck a terrorist cell in Lebanon that attempted to launch anti-tank missiles toward Israeli territory."

"In addition, terrorists attempted to carry out a number of launches toward the area of ​​Misgav Am in northern Israel, as well as IDF posts in the areas of Metula and Yiftah," the IDF said in a statement. "No injuries were reported."

"In response, IDF soldiers are striking with artillery fire toward the sources of the launches," the IDF added.

In recent weeks, there have been continued exchanges between Israeli forces and Lebanese militant group Hezbollah along the Israel-Lebanon border. Although the clashes remain within the notional 10-kilometer corridor along the shared border, they are now a daily occurrence and have intensified in recent days, which raises the potential for escalation as each side responds to the other's strikes.

Hezbollah leader Hassan Nasrallah has been walking a delicate line with regard to the group's response to the latest outbreak of war between Israel and Palestinian militant group Hamas. In remarks made a couple weeks ago, Nasrallah effectively distanced himself from Hamas' Oct. 7 attack on Israel, saying it was wholly a Palestinian conceived, planned and undertaken operation. At the same time, he has pledged support to the Palestinians in their struggle amid Israel's bombardment of the Gaza Strip. He also said that Hezbollah had joined the fight against Israeli forces from Oct. 8 with strikes across the border, but ruled out a full-scale war at this time.

Meanwhile, Hezbollah has been scrupulously issuing regular statements taking responsibility for strikes on northern Israel and providing precise details.

The types of ordinance used in these cross-border strikes are also ramping up. The Lebanese Armed Forces recently posted on their official Facebook page "general guidelines for avoiding the dangers of phosphorus munitions." Lebanon has repeatedly accused Israel of using incendiary and phosphorus munitions in their attacks.

But Hezbollah's leader made clear in his speech last Saturday that the group does not want a war with Israel right now. Acting Lebanese Prime Minister Najib Mikati has indicated the same and has praised the patriotism and restraint of Hezbollah.

For now, there appears to be a slow-burn battle between Israel and Hezbollah but within the 10-kilometer corridor of the border and therefore contained. It's unclear how long that will last.

-ABC News' Ghazi Balkiz, Marcus Moore and Bruno Roeber

U.S. National Security Council spokesperson John Kirby told ABC News on Thursday that "there's still working going on, literally by the hour," to secure the release of the remaining hostages being held by Hamas in the Gaza Strip.

"We've got folks on the ground. We've been talking to them, our negotiators are talking to their negotiators and we're working on this really, really hard," Kirby said during an interview on "Good Morning America."

"I don't have an announcement to make today," he added. "But, as the president said yesterday, we're hopeful that we can actually get a good result here."

-ABC News' Morgan Winsor

Patients and doctors evacuated the Al-Shifa hospital on Saturday, after the Hamas-run Gaza Health Ministry claimed Israel forced them to leave. The IDF released a statement denying it ordered the evacuation, but in a Friday briefing another spokesperson said the IDF was urging anyone left in Al-Shifa hospital to leave and that it hoped it would take place in the "next few hours."

Doctors described their exodus from the hospital to ABC News, with Dr. Ahmed Mokhallalati -- who is still in the hospital -- saying "all critical ICU patients have died. The situation is terrifying."

"Today early in morning people were forcefully evacuated from the hospital, with absolutely no plan of evacuation of the patients and the medical staff. Most of the civilians together with most of the staff left the hospital," Mokhallalati said.

Mokhallalati said there are around 300 patients, who cannot move, and less than 50 medical staff still in the hospital.

"There are still 33 premature babies in the hospital -- one baby died yesterday, and two babies were taken by their parents to evacuate with them. There is only one neonatologist and one nurse with them," he added. The Israelis have provided only three transport incubators for 33 babies. So, if they tell us 'you have to evacuate now,' I have no idea how to evacuate them."

Dr. Adnan Al-Barash, head of the orthopedic department at Al-Shifa Hospital, told ABC News that the "Israeli army forced us to leave the hospital at gunpoint."

"The path for us to walk was set out among the tanks, we had elderly, wounded… The scene was very tragic and sad," Al-Barash said.

"We went out between the tanks, and we could not get the wounded out on the broken roads and we could not move wheelchairs for the wounded," he added.

-ABC News' Dragana Jovanovic and Zoe Magee