PARIS - A freed French hostage has said the suspected gunman behind the deadly shooting at the Jewish Museum in Brussels in May was among his Islamic extremist captors in Syria.
Writing on the website of his former employer Le Point magazine, Mr Nicolas Henin said Mehdi Nemmouche, who has been extradited to Belgium and held for questioning, was his jailor between July and December 2013.
One of a group of four journalist hostages freed in April, Mr Henin said the 29-year-old, who spent more than a year fighting in Syria, was a feared and violent figure. "When Nemmouche was not singing, he was torturing," wrote Mr Henin. "He was part of a small group of Frenchmen whose visits would terrify the 50-odd Syrian prisoners held in the cells nearby."
"Every night the blows would start raining down in the room, where I was also interrogated. The torture lasted all night, until dawn prayers."
Interior Minister Bernard Cazeneuve confirmed that French intelligence services had "transferred elements to the judiciary that suggest (Nemmouche) may have been the jailor of our hostages", following a report in Le Monde newspaper.
A police source told AFP the freed hostages had recognised Nemmouche from photographs following his arrest.
Le Point said that Mr Henin had kept quiet on Nemmouche's role in his detention to protect the Western hostages still being held by Islamic State of Iraq and Syria militants, but decided to speak out following Le Monde's report.
Mr Henin's lawyer Marie-Laure Ingouf told AFP that "Nemmouche was one of his jailers". "All the hostages confirm this. They lived alongside him for several months."
The Frenchman of Algerian descent was remanded in custody in early August on charges of "murder in a terrorist context" over the May 24 shooting, which left four dead.
He is slated to appear on Sept 12 before a Brussels judge who will decide whether to extend his preventive detention.
The attack in broad daylight left an Israeli couple, a Frenchwoman and a Belgian man dead, and raised fears of terror attacks from foreign fighters returning from Syria.
Nemmouche was arrested in the southern French city of Marseille days afterwards.
He has been sentenced seven times in France, including for armed robbery, and has spent seven years in jail where he was notably found proselytising Islam.