The Israel Defense Forces denied carrying out a strike that hit an outpatient clinic at Gaza's Al-Shifa hospital Friday morning, stating it was a "misfired projectile launched by terrorist organizations inside the Gaza Strip."

There were two incidents at the hospital Friday morning, according to videos verified by ABC News. In one incident, a shell hit the refugee encampment outside of the hospital entrance. In the second incident, a strike hit the outpatient clinic where people were sheltering.

The Hamas-run Gaza Health Ministry blamed the Israeli military for the strike that hit the outpatient clinic.

As the humanitarian crisis in Gaza continues to worsen by the day, Jens Laerke, spokesperson for the United Nations humanitarian office, said, "If there is a hell on earth today, its name is northern Gaza."

"People who remain there, the corners of their existence are death, deprivation, despair, displacement, and literally, darkness," Laerke said. "The entire Gaza Strip has been plunged into darkness. … What do you tell your children in such a situation? It's almost unimaginable."

People are fleeing Gaza's Al-Shifa hospital, sources confirmed to ABC News, in the wake of a strike on the exterior area of the hospital's outpatient clinic. One surgeon told ABC News "everyone" has fled, calling it a "nightmare."

The hospital has been treating thousands of wounded people and housing as many as 80,000 displaced residents, according to The Associated Press.

The hospital's head of plastic surgery, Dr. Ahmed Mokhallalati, told ABC News he is among the roughly 15% to 20% of staff members still there on Friday.

Although many patients have evacuated, he said, "There is no hospital in Gaza that can accommodate this number of ICU patients -- around 100 ICU patients."

The Palestinian Red Crescent said occupation snipers fired on Gaza's Al-Quds Hospital, killing at least one and injuring at least 28.

Israel Defense Forces spokesman Richard Hecht said, "The IDF does not shoot at hospitals. If there are Hamas terrorists in the hospitals, the IDF will do what it needs to, but we are aware of the sensitivity. We tell Hamas to move the sick southward."

"Slowly we are closing in on them and taking every precaution not to harm the innocent," he said.

American diplomats abroad are giving stark warnings about the long-term ramifications of the war, telling their Washington counterparts in multiple diplomatic cables that their work and public opinion of the U.S. in the Arab world could be lost and denigrated for a generation, a State Department source told ABC News.

Diplomatic cables are how U.S. embassies around the world privately communicate with State Department leadership about what U.S. diplomats are seeing on the ground. While some are just regular updates, others contain candid assessments and analysis about what senior embassy staff are seeing on the ground and the potential impacts on U.S. foreign policy or the U.S. standing in the region.

Fighting between Hezbollah and Israeli forces intensified Sunday in southern Lebanon, where the terrorist group has claimed responsibility for launching a series of missile strikes on northern Israel, Israeli military officials say.

“Hezbollah is dragging Lebanon into a war that may happen, and it is making mistakes," Israeli Defense Minister Yoav Gallant said on Saturday. “If it makes mistakes of this kind, the ones who will pay the price are first of all the citizens of Lebanon. What we are doing in Gaza we know how to do in Beirut."

Hezbollah has claimed responsibility for at least five attacks in northern Israel, including one it says resulted in numerous deaths and injuries. The terrorist group also claimed one of its missile strikes targeted Israel's Zarit Barracks on the Israeli-Lebanese border.

Hezbollah has been designated a terrorist organization by multiple countries, including the U.S. and Israel.

Fighting between Hezbollah and Israeli troops intensified Saturday night into Sunday. Local news media broadcast images of the heavy clashes in the hills along the border and smoke rising.

Lebanese Prime Minister Najib Mikati released a statement saying his country does not want war but has made a contingency plan in case it is drawn into the conflict between Israel and Hamas.

"What matters to me is that Lebanon stays away from war and looks forward to stability," Mikati told the Al Jazeera network.

During the Al Jazeera interview, Mikati called for an immediate ceasefire in Gaza.

-ABC News' Marcus Moore