The brother-in-law of one of the men who attacked the satirical Charlie Hebdo newspaper in Paris has been detained in Bulgaria.
Authorities say he is suspected of trying to join extremists in Syria.
Mourad Hamyd was initially suspected of a role in the January 2015 attack on the paper, but his high school classmates launched a successful social media campaign to clear his name - saying he was in class at the time.
"I am a student who lives peacefully with his parents," he said then.
The Paris prosecutor's office said that someone "close to Hamyd" flagged his probable trip to Syria, and he was detained near the border in late July.
Hamyd's sister was married to Cherif Kouachi, one of two brothers who carried out the deadly attack at the Charlie Hebdo offices.
"His behaviour was typical for a foreign fighter and that's how he was identified," Bulgarian Interior Minister Rumyana Bachvarova said.
She also confirmed that a European arrest warrant had been issued, saying that further details would be announced after a court hearing on Wednesday.