Four more people have been arrested as part of the investigation into last month's theft of precious jewellery at the Louvre Museum, the Paris prosecutor's office says. Two men, aged 38 and 39, and two women, aged 31 and 40, were arrested on Tuesday. They are all from the Paris region. Among them is thought to be the last member of a four-man gang that allegedly carried out the daylight heist, according to French media. The other three suspected thieves have already been arrested and charged, officials say.

Police have up to 96 hours to question them. No trace has so far been found of the stolen jewels - worth €88m (£76m; $102m) - which were taken on 19 October.

Four people have already been charged over the heist - three men and a woman, who also live in the Paris region. A 38-year-old woman was charged with complicity in organised theft and criminal conspiracy, while a 37-year-old man was charged with theft and criminal conspiracy. Both suspects have denied any involvement.

In October, the theft occurred when the group used a stolen vehicle-mounted mechanical lift to access the Galerie d'Apollon. They utilized a disc cutter to break open display cases housing the jewels. The audacious heist took just four minutes, and the thieves made their escape on scooters before switching to cars. One of the stolen items - a crown - was dropped during the getaway, but eight valuable pieces, including a necklace once belonging to Empress Marie-Louise, were taken.

Following the heist, security measures have been boosted, and some jewels have been moved to the Bank of France for safekeeping.