It appears that a man attacked a police man with a hammer. The wounded officer fired twice at the hammer-wielding man in the square in front of the cathedral, French police told Fox News. The attacker was hospitalized; the specific conditions of both men were unclear.
No one has claimed responsibility yet.
The French prosecutor office says counter terror bureau opening probe into the NotreDame incident.
The French interior minister said the suspect had been threatening several policemen and passersby at the time.
Paris has been under high security after a string of Islamic extremist attacks in recent years. France has ben under a state of emergency since November 2015 Paris attacks.
There is number of police in the area and people are urged to avoid the famous cathedral.
US Embassy in France has advised US citizens to avoid the area & follow advise of the authorities. Meanwhile the US authorities have warned of more terror attacks in Europe many of them related to ISIS.