Couples held over Paris car with gas canisters

French police investigating a car containing six gas canisters discovered near the Notre Dame Cathedral in central Paris detained a second couple overnight.

The detention raises to four the number of people held in connection with the abandoned Peugeot 607, which had no number plates and was spotted during the weekend by a bar employee working in the area that is hugely popular with tourists.

Anti-terror investigators are probing the incident which comes with France on high alert following a string of attacks, including November's coordinated Islamic State group assaults in Paris by gunmen and suicide bombers that killed 130 people.