Police in Toulouse in south-west France have arrested a man for planning to commit a terror attack on New Year’s Eve, a police source told Reuters.
Two other people, one of whom is suspected of planning an attack on police officers, were arrested in Toulouse in a separate raid.
Police told local media the suspects had been under police surveillance for several months.
In 2012, Islamic extremist Mohammed Merah killed seven people in attacks targetting Jewish civilians and Muslim members of the French armed forces in Toulouse.
France remains in a state of emergency after the November 2015 Paris attack, and attacks in Nice in France and in a church in Normandy early in the summer.
An attack on a Christmas market in German capital Berlin on 19 December left 12 people dead, and resulted in a Europe-wide manhunt which ended with suspect Anis Amri being shot dead by police in Milan, Italy.