As a truce ended between Israel and Hamas on Friday, both sides traded blame for reigniting the war.

Israel accused Hamas of violating the cease-fire by firing rockets toward Israeli territory just after 7 a.m. local time, as negotiations failed to further extend the truce. The Israeli military has since resumed combat in the Hamas-ruled Gaza Strip, with ground, air and naval forces striking more than 200 "terror targets" in the north and south thus far, according to the Israel Defense Forces.

Meanwhile, Hamas accused Israel of "persistently rejecting" all its offers to release more hostages in Gaza amid negotiations to extend the cease-fire agreement on Thursday night. Hamas alleged that it had offered to hand over more Israeli detainees, including the elderly, as well as the bodies of those who have died in captivity, which the militant group claimed was a result of previous Israeli bombings.

"However, the [Israeli] occupation, driven by a predetermined decision to resume criminal aggression, remained unresponsive," Hamas said in a statement.

-ABC News' Morgan Winsor

An Israeli kibbutz confirmed Friday the death of three of its residents who were taken hostage by Hamas during the Oct. 7 attack.

Kibbutz Nir Oz announced that 85-year-old resident Aryeh Zalmanovich has died in Hamas captivity in the Gaza Strip. Zalmanovich was one of the founders of the kibbutz, which is located in southern Israel near the border with Gaza.

“Father of two sons and grandfather of five grandchildren. Aryeh was a man of the land all his life who was engaged in agriculture and field crops,” the kibbutz said in a statement. “A man of books and has a wide knowledge of history and knowledge of the country.”

Gaza's militant rulers, Hamas, released a video in mid-November that appeared to show Zalmanovich looking ill. The group claimed he had later died.

Kibbutz Nir Oz also announced that 54-year-old resident Ronen Engel has died in Hamas captivity in Gaza. The kibbutz described Engel as a "photographer, MDA volunteer and motorcycle enthusiast." His wife and two daughters were also kidnapped to Gaza on Oct. 7 and released this week, according to the kibbutz.

A third resident of kibbutz Nir Oz, 56-year-old resident Maya Goren, was also confirmed to have died in Hamas captivity in Gaza. Her husband was among those killed on Oct. 7, according to the kibbutz.

"Maya was a hardworking and dedicated kindergarten teacher, and gave loving care to the kibbutz children for many years," the kibbutz said in a statement.

-ABC News' Yael Benaya and Morgan Winsor

Israel will no longer hold fire as negotiations with Hamas progress, an Israeli security source told ABC News on Friday.

The source said Israeli forces will only cease-fire for 24 hours if Hamas sends a list of at least 10 hostages to be released, the list is approved by Israel and everyone on that list is safely returned home.

-ABC News' Matt Gutman

United Nations High Commissioner for Human Rights Volker Turk warned Friday that the resumption of hostilities between Israel and Hamas in the Gaza Strip is "catastrophic," with the situation now "beyond crisis point."

"I urge all parties and states with influence over them to redouble efforts, immediately, to ensure a ceasefire -- on humanitarian and human rights grounds," Turk said in a statement.

-ABC News' Edward Szekeres and Morgan Winsor

The United States will send three relief flights into Egypt on Tuesday to keep up the flow of humanitarian aid into the war-torn Gaza Strip, which has reached its highest levels as officials take advantage of the current humanitarian pause.

"The movement over the last four or five days of assistance has been so significant in volume that a backfill in El Arish [International Airport in Egypt] is now needed, and these planes are part of that backfill," a senior Biden administration official told reporters during a telephone call on Monday afternoon.

Some 800 trucks carrying aid have crossed into Gaza during the first days of the pause, officials said, which is a huge increase from the days prior. So far, a total of about 2,000 aid trucks have entered Gaza since Oct. 7, meaning that 40% of them had gone in in just the last four days.

The planes on Tuesday will be carrying medical aid urgently needed in Gaza as well as food, particularly for children, and winter clothing as the rainy season begins, according to officials.

The aid will be delivered by the United Nations to civilians.

Two more planeloads are expected to follow in the coming days, officials said. Previously, there were also five commercial flights of aid coordinated by the U.S. government, according to officials.

The officials emphasized this aid as part of U.S. President Joe Biden’s commitment to helping the Palestinian people, saying that he has made sure America is the largest single donor both to the United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) and to Palestinian territories.

Going forward, the officials said the goals for humanitarian aid in Gaza will be expanding access, pushing for restoration of essential services, especially water, and keeping civilians out of harms way.

"The president has also consistently stressed the importance of ensuring military operations are conducted in a manner consistent with international humanitarian law, including with respect to the protection of civilians," the senior Biden administration official told reporters.

Officials did not offer any new information on the hostage negotiations between Gaza's militant rulers, Hamas, and Israel but reiterated that they hope to see Americans released in the coming days.

-ABC News' Cheyenne Haslett and Morgan Winsor