Supply shortages could worsen aid workers' means to provide care, MSF said.
A ceasefire went into effect at 4 a.m. local time Wednesday morning after Israel's Cabinet approved the U.S.-backed proposal to end the fighting between Israel and Hezbollah after prolonged negotiations.
The Israel Defense Forces continues its intense airstrike and ground campaigns in Gaza, particularly in the north of the devastated Palestinian territory.
Tensions also remain high between Israel and Iran after tit-for-tat long-range strikes in recent months and threats of further military action from both sides.
At least 75 people were killed in two air strikes in Beit Lahia in northern Gaza, according to Gaza’s Civil Defence.
Video circulating online shows bodies under rubble, which the group said they are unable to reach as they remain trapped.
-ABC News' Samy Zyara
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.”
