Israel believes that more than a third of the remaining Gaza hostages are dead, a government tally showed, as the United States sought to advance their recovery under a proposal to wind down the conflict with Hamas, Reuters reports.

Of about 250 people dragged into the Gaza Strip by Hamas during the Oct 7 cross-border rampage that sparked the offensive, scores were freed in a November truce, while others have been recovered — dead or alive — by Israeli troops.

The government tally said 120 remain in captivity, 43 of whom have been declared dead in absentia by Israeli officials based on various sources of information, including intelligence tip-offs, CCTV or bystander videos and forensic analysis.

Some officials have privately said that the number of dead could be higher.

Hamas, which threatened at the outset of the conflict to execute hostages in reprisal for Israeli air strikes, has since said such attacks caused hostage deaths. Israel has not ruled that out in all cases, but said that some recovered hostage bodies showed signs of execution.

On Monday, four more hostages were added to Israel’s list of fatalities.