An Israeli hostage who was freed as part of a temporary truce in Gaza had previously mounted a brief escape from his Hamas captors after the building where they were holding him collapsed during a bombing, his relatives said.
Roni Kriboy, 25, was a surprise addition to the list of hostages released on Sunday, alongside 13 women and children who had been pre-agreed in mediated Israel-Hamas negotiations.
Citing Mr Kriboy's dual Russian citizenship, Hamas said he was freed to show appreciation for Moscow, the only world power openly engaging the group during the now seven-week-old war.
Like other recovered hostages, Mr Kriboy has been kept away from the media in what Israeli authorities describe as an effort to focus on helping with their physical and emotional recovery.
His family said Mr Kriboy had vanished while working as a stagehand at an outdoor dance party where armed Hamas militants killed 364 revellers on 7 October, out of a total death toll of 1,200.
Israeli authorities determined a week later that he was among some 240 people taken captive.
Mr Kriboy's aunt, Yelena Magid, said in an interview with Israel's Kan radio that she spoke to Mr Kriboy after his return.
"He recounted being seized by terrorists, who held him in a building that was bombed," she said, in an apparent reference to Israeli shelling, adding that he sustained head wounds there.
"He managed to escape and to hide out, alone, for four days. He tried to reach the border. In the end, the Gazans caught him and returned him to the terrorists' hands."
Mr Kriboy's cousin, Alex Magid, gave a similar account in an interview to Israel's Army Radio, adding that the bombing of the building killed several Palestinian gunmen.
Six hostages still in Gaza hold Russian citizenship, according to the Israeli government.
