Last month's jewellery heist at the Louvre museum was carried out by petty criminals rather than organised crime professionals, Paris's prosecutor has said.

This is not quite everyday delinquency... but it is a type of delinquency that we do not generally associate with the upper echelons of organised crime, Laure Beccuau told franceinfo radio.

She said four people arrested and charged so far over the theft that shocked France and the world were clearly local people living in Seine-Saint-Denis, an impoverished area just north of Paris.

Jewels worth €88m (£76m; $102m) were taken from the most-visited museum, in the French capital, on 19 October.

In Sunday’s interview to franceinfo radio, Beccuau said the four arrested people - three men and a woman - all live more or less in Seine-Saint-Denis.

She said two of the male suspects had been known to the police, as they each had multiple theft convictions.

On the day of the heist, the suspects arrived at 09:30 local time (07:30 GMT), just after the museum opened to visitors. They used a stolen vehicle-mounted mechanical lift to access the Galerie d'Apollon via a balcony near the River Seine.

Pulling off the audacious theft in just four minutes, they escaped via scooters and cars. One item, a crown, was dropped during the escape. The fate of the remaining jewels remains uncertain, raising concerns they might have been smuggled abroad.

Security measures have since been tightened around France's cultural institutions, with the Louvre transferring some of its most precious items to the Bank of France following the incident.