Paris (CNN) The Vatican's envoy to France, Archbishop Luigi Ventura, is under investigation for sexual assault, a French judicial source told CNN Friday.

The Paris prosecutor's office opened an investigation on January 24, the source said.

Ventura, 74, has been based in Paris since 2009, serving as a diplomat for Pope Francis, as reported by Agence France-Presse (AFP).

The archbishop is alleged to have inappropriately touched a junior male official working at the Paris city hall, Paris deputy mayor Patrick Klugman told CNN Friday.

He added that following the alleged sexual assault, the city hall filed a complaint with the Paris prosecutor.

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