Three Al-Jazeera journalists have been arrested for illegally flying a drone.

Paris prosecutors said the three foreign nationals aged 70, 54 and 36 were taken into custody after police spotted the drone flying in the Bois de Boulogne woods in western Paris.

They can be held for a maximum of 24 hours under French law. Flying drones without a licence in France is illegal and carries a maximum one-year prison sentence and a €75,000 fine.

The arrests come as unidentified drones flew over the Eiffel Tower and key Paris landmarks five times for a second night running on Tuesday night, baffling French authorities.

France has ramped up security nationwide after the January terror attacks in Paris that left 20 people dead.

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