Israel-Gaza-Lebanon live updates: American hostage's father makes plea to Biden and Trump

Doctors Without Borders, also known by its French name Médecins Sans Frontières (MSF), is warning that people in Gaza with medical conditions are facing mounting catastrophes this winter.

Shortages of food, medicine, water, shelter and other crucial supplies are at critical levels, the humanitarian group said, and could worsen aid workers' means to provide care.

"Shortages of critical supplies have reached such levels that we are now forced to turn away patients in some facilities," Caroline Seguin, MSF’s emergency coordinator in Gaza, said in a statement. "Restrictions and obstacles to the entry of aid by the Israeli authorities continue to severely hamper our ability to provide care. Meanwhile, the looting of aid trucks within the enclave is making it difficult for that small amount of aid allowed by Israeli authorities to reach those in need. Ultimately, it’s the patients who suffer the consequences."

The Israel Defense Forces launched another airstrike in southern Lebanon on Friday after it said they identified "terrorist activity and movement of a Hezbollah portable rocket launcher."

The IDF said the "threat was thwarted in an IAF strike."

"The IDF is deployed in southern Lebanon and will actively enforce violations of the ceasefire agreement," it said in a statement.

-ABC News' Dana Savir

Israeli Prime Minister Benjamin Netanyahu has threatened an "intensive" war if Hezbollah violates the ceasefire agreement, according to an interview he did with a local reporter.

"I gave the IDF instructions," Netanyahu said, speaking to the right-wing Channel 14. "If there is a massive violation of the agreement ... we [will] operate surgically like we are doing now, and with force ... I instructed the IDF to prepare for an intensive war.”

The Israel Defense Forces said it fired at suspected terrorists Thursday. Hezbollah has not yet commented on the strike and there have been no indications rockets have been fired into Israel from the north.

"The IDF remains in southern Lebanon and acting to enforce violations of the ceasefire agreement," the IDF said in a statement.

The Lebanese Army confirmed the strikes hit within its territory, saying Israel "violated the agreement several times" on Wednesday and Thursday.

"After the ceasefire agreement was announced, the Israeli enemy violated the agreement several times, through air violations and targeting Lebanese territory with various weapons. ‎The Army Command is following up on these violations in coordination with the relevant authorities," the Lebanese army said in a statement.