The family of hostage Bar Kupershtein said they received a sign of life from him via hostages who returned from captivity, Israeli media reported on Tuesday.
The 22-year-old's brother said during a Knesset committee on Tuesday that he knows "100% that Bar is alive."
"But tomorrow everything can change, even in another hour, another minute. We have no time to waste," he added.
"He was the one who evacuated the wounded under fire to save lives at the Nova party. He was the one who went back again and again, just to save one more person.
'No one to save him'
"But the moment he needed help, there was no one there to save him. I ask you—what would you do if it were your brother? Your son? When did we become people who just stand by and move on?" his brother said.
Bar Kupershtein, 23, was kidnapped on October 7, 2023, from the Nova Music Festival in Re'im.