The people of France are on edge - nervous following multiple terror attacks on the country.
The Paris bombings in November, the French Riviera attack two weeks ago, and now the killing of a priest last night - have all been claimed by Islamic State.
Counter-terrorism expert Yan St-Pierre told Mike Hosking in Europe, and France especially, people now jump to conclusions on all acts of violence.
"ISIS, Al Qaeda, any terrorist groups now have the upper hand, because people have become in many ways fearful or at the very least automatically link violence to terrorism."
He believes there're two questions to be answered around "lone wolf" and terror attacks.
Why those committing acts of violence are almost all young people - and whether a person's mental capacity is the reason for their fatal decision.
St-Pierre said overwhelmingly, those committing attacks are under 30, and almost always, the person's been treated at some point for their mental health.
LISTEN ABOVE: Counter-terrorism expert Yan St-Pierre speaks with Mike Hosking