The Israel Defense Forces confirmed the death of four additional hostages Monday.

The IDF said the four hostages were killed during an Israeli operation in Khan Younis in southern Gaza. The four men, British-Israeli Nadav Popplewell, 51, Chaim Peri, 79, Yoram Metzger, 80, and Amiram Cooper, 85, were all kidnapped from kibbutzes on Oct. 7. 

“We assess that the four of them were killed while together in the area of Khan Younis during our operation there against Hamas,” IDF spokesman Rear Adm. Daniel Hagari said, but he did not provide further details.

Last month, Hamas claimed Popplewell had been killed, but the report had not been verified until now. In December, Hamas released a video of the other three men, which Israel described as a “criminal terror video.”

“Chaim, Yoram, Amiram, and Nadav were kidnapped alive, some of them were with other hostages who returned in the previous deal — and they should have returned alive to their country and their families,” the Hostages and Missing Families Forum said in a statement. 

The forum said the hostages’ deaths should “lead every leader to profound soul-searching.”

The announcement comes days after President Joe Biden unveiled Israel’s three-part proposal for “an enduring ceasefire” between the Jewish state and Hamas.

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Under the plan, female and child hostages would be released in exchange for Palestinian prisoners and the IDF would withdraw from “populated areas of Gaza.” Then, the exchange of all living hostages would transpire, including male soldiers. The third phase would create “a major reconstruction plan for Gaza,” with “any final remains of hostages who’ve been killed” being “returned to their families,” according to Biden.

Around 120 hostages remain unaccounted for, but Israeli officials have previously said they presume many are now dead. Eighty are believed to still be alive.