A gunman has opened fire at a supermarket near Paris injuring two people, French Police said.
The incident was not at first sight considered to be a possible act of terrorism, a spokeswoman for the Versailles public prosecutor's office said.
The gunman is said to be known to police for violent behaviour, according to BFM TV.
The spokeswoman said the man, believed to be in his 60s, went back to his home and elite police were now at the building.
"He went home and the RAID (elite police unit) is readying for negotiations with him," said the spokeswoman.
A boy of 15 has been arrested in Paris on suspicion of preparing an imminent terrorist attack, French judicial sources have said.
It comes only a week after French police said they had foiled another terrorist plot to attack a train station by three women who were said to have been directed by so-called Islamic State.
The teenage boy, who has not been named, is said to have been planing an attack in a public place in the French capital, one of the legal sources said.
He is also alleged to have been in contact with an Islamist fighter in Syria alleged to have helped guide one of the women in the earlier terror plot, according to the second source.
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A minute's silence was observed before the start of today's stage and security has been tightened in response to the deaths.
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French police arrested 85 people before Thursday's protest march in Paris against proposed labour reforms - mainly for carrying objects that could be used as projectiles.
At least one of those arrested was on a list of around 100 people who had been barred from the march.
The protest set off from Place de la Bastille early Thursday afternoon under tight security after a previous march saw bloody clashes between police and protesters.
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Two people close to a man who killed two French police officers in a Paris suburb on Monday night have been held for questioning, a police source has said.
The source added that the attacker had been put under wiretaps recently without any results.