Belgian authorities have transferred Mehdi Nemmouche, the French extremist who killed four people at a museum in 2014, to Paris for questioning over his suspected role in the kidnapping of four journalists in Syria in 2013, AFP reported Friday (May 17th).

Nemmouche, 34, was sentenced to life in prison in March for the rampage in Brussels, when he gunned down two tourists, a volunteer and a young employee.

The museum attack came after his return from Syria's battlefields, where Nemmouche is accused of acting as the jailer of four French journalists taken hostage by extremists in the northern city of Aleppo in 2013.

During his Brussels trial, two of the journalists testified they had no doubt Nemmouche was one of their captors.

He was brought to France on Wednesday and is being held at the Meaux-Chauconin prison east of Paris, a legal source said.

Nemmouche and Nacer Bendrer, his accomplice in the museum attack, were already expected to serve their sentences in France.

The journalists were held by the "Islamic State of Iraq and Syria" (ISIS) in Aleppo for 13 months until their release in April 2014, when they were found blindfolded and with their hands bound in the no-man's land on the border between Syria and Turkey.