As revelations emerged on Wednesday that the US spied on not one, but three French presidents, focus was being turned to the roof of the US embassy in Paris.

The embassy is located just a stone's throw away from the Elysée palace where the three presidents Jacques Chirac, Nicolas Sarkozy and François Hollande all resided over the last ten years.

Liberation newspaper, one of the publications that revealed the spying claims, suggested the building is home to secret rooftop spy station hidden behind a canvas, with fake windows painted on it.

It might seem too simple to be true but according to Liberation this is where the US intelligence services snooped on communications from the Elysée and various ministries, all located nearby.

The paper claims the Special Collection Service, a unit combined by the members of the CIA and the NSA, were in charge of collecting the data.

No doubt the United States envoy to France, Jane Hartley will be grilled over the spy nest after she was summoned to France's foreign ministry on Wednesday.

The spying den was installed back in 2004/05 during work on the roof of the embassy, the paper claims.