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.

A Paris prosecutor said two men and two women were arrested as part of an investigation into the robbery at the museum.

France's Louvre Museum on Monday closed a gallery hosting Greek vases and office spaces as its structures designed in the 1930s are in a dire state, the world's most visited museum said, less than a month after a daring heist exposed its vulnerabilities.

Des Cars stressed security improvement is a priority of the decade-long “Louvre New Renaissance” plan launched earlier this year, with an estimated cost of up to 800 million euros ($933 million), to modernize infrastructure, ease crowding and give the Mona Lisa a dedicated gallery by 2031.