Anti-terror prosecutors now have up to one month to present their conclusions to the judges, who will then announce a trial date.
A maritime border operation coordinated by Interpol has detected more than a dozen suspected "foreign terrorist fighters" (FTFs) travelling across the Mediterranean.
Deby's regime is widely perceived by its Western allies as a key partner in the fight against Islamic terror groups, which is why he has retained their support thus far.
The number of deaths from terrorism is down for the third consecutive year, the Global Terrorism Index 2018 says. But the far-right political terrorism is on the rise, it adds.
The 31-year-old Russian man was arrested in Berlin.
French company La Barrière Automatique (LBA) has developed a retractable device that can stop a 7.5-ton truck going at 80 km/h in its tracks.
Paris is constructing bulletproof walls and metal fences around the monument in a bid to protect it from terrorist attacks.
What purpose does France’s list of terror suspects serve, and why have some criticised it?
Counter-terrorism officers in Greece launched an operation in the early hours of Tuesday to arrest suspected members of a far-right extremist group calling itself Combat 18 Hellas