France's Louvre Museum will install 100 external cameras by the end of 2026 as part of measures to tighten security after last month's spectacular heist.

Director Laurence Des Cars also told a National Assembly hearing that ties with Paris police would be tightened with the installation of an "advanced police station within the Louvre's estate".

The daylight October 19 robbery, in which four robbers made off with jewels worth $US102 million ($157 million), has raised doubts over the credibility of the world's most-visited museum as a guardian for its myriad works.

While investigators have charged four suspects accused of involvement in the raid, the treasures have yet to be recovered.

Officials have admitted there was inadequate security camera coverage of the outside walls of the muse

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