Belgian authorities say that searches in the wake of last year's deadly attacks in Paris have uncovered video linked to a person working in Belgium's nuclear industry.
The federal prosecutor's office said in a statement on Wednesday that an "investigation is actively ongoing."
Belgian media reported that several hours of video was filmed near the home of a man thought to be a senior official at the Mol nuclear waste facility in the Flanders region. The house of the unidentified man was apparently filmed from a nearby wood.
Prosecutors declined to confirm that information or provide details.
Security services have long feared that extremists might get their hands on radioactive material.
It comes as a cloud hangs over some Belgium's nuclear plants after a number of unplanned shutdowns.
The November 13 attacks in Paris and Saint Denis targeted a music club, bars, restaurants and a football stadium, killing 130 people. They were carried out by three groups of Daesh terrorists.
