Israel's top security agency, the Shin Bet, admitted in a report that it had underestimated signals that the Palestinian group Hamas would attack in October 2023. The agency has conducted its own investigation into one of Israel's most devastating security failures, Reuters reported.
Shin Bet chief Ronen Bar said he would resign and take responsibility for the failures to protect Israeli civilians.
Some Israeli media outlets said the Shin Bet findings were handed over to Prime Minister Benjamin Netanyahu's office, which did not respond to a request for comment from Reuters.
The report was published five days after the military released the results of an investigation that found it had drastically underestimated Hamas' capabilities and "failed in its mission to protect Israeli civilians."
A published summary of the Shin Bet investigation said that if it had "acted differently in the years leading up to the attack, Hamas" and on the night of the attack, the massacre would have been prevented.
"This is not the standard we expected of ourselves and the public from us," the report said.
Both investigations were released as calls grew among the Israeli opposition and civil society for a national inquiry into the government's failures on the deadliest day in Israel's modern history.
Soon after the war began, the Israeli army and its main intelligence agencies admitted that they had failed to predict the lightning attack by thousands of armed men led by "Hamas".
The Israeli army's findings focused on tactical, combat and intelligence failures before, during and in the days after October 7. The chief of staff of the armed forces, Lieutenant General Herzi Halevi, announced his resignation in January, taking responsibility for the army's failure.
But the political establishment has so far avoided accountability despite repeated calls for Prime Minister Benjamin Netanyahu to conduct a full national investigation.
In a heated parliamentary debate on Monday, Netanyahu said that an investigation would eventually be conducted, but that it must be "objective, balanced and independent" of predetermined findings.
"Hamas" fighters from Gaza invaded southern Israel on October 7, 2023, killing 1,200 people and taking more than 250 hostages, according to Israeli figures.
More than 48,000 people have been killed in Israel's war on Gaza since then, according to Palestinian health officials, with the tiny enclave largely destroyed and most of its 2.3 million people displaced, aid agencies say. About 400 Israeli soldiers have also been killed.
A fragile ceasefire has been maintained in Gaza since January 19.
Israeli forces killed a Hamas commander in the West Bank city of Jenin, as an operation against armed groups in the area continues that has forced tens of thousands of Palestinians to flee their homes.
The military said it had launched a raid to arrest Aysar Saadi, the head of the Hamas network in the area, and killed him in a shootout that also killed another Hamas operative. Three other Hamas members were arrested, the statement said.
The Gaza-based armed group, which has also built a powerful presence in the occupied West Bank, confirmed Saadi's death but said it would not affect its commitment to fighting Israel.
The West Bank operation, which began in January after fighting ceased in Gaza under a ceasefire agreement brokered by Qatar and Egypt, was one of the largest organized in the region in years and followed a wave of violence since the start of the Gaza war in 2023.