French anti-terror police carried out a major operation near Paris on Thursday afternoon, following an anonymous tip-off of plans to launch violent action, sources said.

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The raid took place in Argenteuil, north of Paris, police and judicial sources told the AFP news agency.

They targeted two addresses, reported to be near a mosque and an Islamic bookshop, and were carried out by elite DGSI units under the supervision of Paris anti-terrorist prosecutors.

No arms or explosives had been found at 4.00pm on Thursday.

The raids, sparked by an anonymous informant, come a week after the Bastille Day attack in Nice, which killed 84 people and injured about 300, and has sparked controversy over its handling.

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