The Israel Defense Forces said Monday morning that its aircraft bombed "approximately 200 Hamas terror targets" in the Gaza Strip overnight as troops continued operations on the ground.

Israeli ground troops struck "terror infrastructure" that was located inside a school in Gaza’s northeastern city of Beit Hanoun, while Israeli fighter jets struck "military infrastructure" as well as "vehicles containing missiles, mortar shells, and weapons," according to the IDF.

Israeli ground troops also directed an aircraft to bomb a "cell of terrorists" and a "weapons storage facility from which the terrorists exited," the IDF said.

Meanwhile, Israeli warships struck "a number of Hamas terror targets" overnight, including "observation posts belonging to the Hamas naval forces and terrorist infrastructure at the Gaza harbor" as well as "Hamas military compounds," according to the IDF.

-ABC News' Morgan Winsor

Over 600 foreign passport holders -- nearly half of whom are Americans and Canadians -- were on a list of people approved to leave Gaza on Sunday. Some 566 foreign passport holders, whose nationalities were not released, later exited the Gaza Strip through Egypt’s Rafah border crossing on Sunday, crossing spokesman Wael Abu Omar told ABC News.

Thirteen wounded Gaza residents and 11 of their family members also left Gaza and entered Egypt on Sunday, the spokesman said.

-ABC News' Ayat Al-Tawy

The Israel Defense Forces has started a ground operation in southern Gaza that "will be no less powerful than" the operations in northern Gaza, IDF Chief of Staff Lt. Gen. Herzi Halevi said.

"We have the capabilities to do it in the most thorough way, and just as we did it with strength and thoroughly in the north of the Gaza Strip, we are also doing it now in the south of the Gaza Strip, and we also continue to deepen the achievements in the north of the Gaza Strip," Halevi said.

The IDF said it's carried out 10,000 airstrikes in the Gaza Strip since fighting began.

"The forces ‘closed circles’ and thwarted terror cells, terror infrastructure, operational apartments, tunnel shafts, weapons warehouses and more,” the IDF said in a statement.

-ABC News' Dana Savir

With the temporary Israel-Hamas cease-fire now over, National Security Council spokesman John Kirby told ABC News' "This Week" that the U.S. is "working at this literally by the hour … if we can get these discussions back going" to get a new pause in place.

Kirby said the Israel-Hamas agreement "fell apart because Hamas was unwilling and refused to come with additional [hostage] lists of women and children -- which we know they are holding -- and put them on the list so that Israel can evaluate that and we can get them exchanged."

Kirby said the U.S. thinks "about eight" Americans remain hostage.

He added, "We don’t have perfect visibility on where they all are, we certainly don’t have perfect visibility on their physical or mental condition."

When asked Sunday about The New York Times report alleging Israel knew about Hamas' attack plan a year in advance, Kirby said the U.S. had no knowledge of the Hamas planning document.

He added, "The focus has got to be on making sure Israel has what it needs to go after Hamas leadership."

The World Health Organization painted a bleak picture of the situation in Gaza on Monday night and called for Israel "to take every possible measure to protect civilians and civilian infrastructure, including hospitals, as per the laws of war."

According to the latest information from the WHO, there are only 18 functioning hospitals in Gaza, with three only providing first aid and the remainder just partial services.

With an increasing number of Palestinians displaced as the war continues, the WHO says, "syndromic surveillance has noted increases in infectious diseases, including acute respiratory infections, scabies, jaundice, diarrhoea, and bloody diarrhoea. Shelters in the south are also reporting cases of acute jaundice syndrome, a worrisome signal of hepatitis." The previously said, "syndromic surveillance systems seek to use existing health data in real-time to provide immediate analysis and feedback to those charged with investigation and follow-up of potential outbreaks."

The WHO warned thousands are likely to be cut off from health care services due to increased ground operations by Israel in southern Gaza. The open hospitals are operating beyond capacity, with the bed occupancy rate at 171% and intensive care units at 221%, the WHO said, based on data from the Hamas-run Ministry of Health.
WHO workers called the situation at the Nasser Medical Complex in Khan Younis "catastrophic, with the building and hospital grounds grossly overcrowded with patients and displaced people seeking shelter."

The WHO said in a statement Monday night it has recorded 203 "attacks on hospitals, ambulances, medical supplies, and the detention of health-care workers attacks on hospitals, ambulances medical supplies" between Oct. 7 and Nov. 28.

"This is unacceptable," the WHO's statement read. "There are means to protect civilians and civilian infrastructure, and they should be instituted."

-ABC News' Jolie Lash and Jade Coburn