[France] The Riviera Knife Attack.

[BIAD]

From Sky News...

'....Meanwhile, the French anti-terrorist prosecutor's department has been asked to investigate the incident.
The assailant was believed to be acting alone, an official said...'

  Acted alone!!!

'...In Paris, lawmakers in the National Assembly observed a minute's silence in solidarity with the victims.

Reuters journalists at the scene said police armed with automatic weapons had put up a security cordon around the
Notre Dame church, which is on Nice's Jean Medecin avenue, the city's main shopping thoroughfare.
Sounds of explosions could be heard as sappers detonated suspicious objects...'

Why...? I thought the Notre Dame fire in Paris was an accident?
Why think another one with the same name would be under a possible attack?