The device was found in Paris under lorries belonging to Franco-Swiss cement company Lafarge Holcim.

Petrol cans were attached to a 'crude detonator' underneath several lorries.

Bomb disposal experts rushed to the site and police cordoned off the area, while nearby buildings were evacuated.

This morning's incident comes as anti-terrorism police investigate the discovery of several gas canisters and a cell phone detonator in western Paris on Saturday, but a source said there was no apparent link between the two.

Six people are in custody over the canisters placed in the hallway of a building in the wealthy 16th district.

In September 2016, five full gas canisters were found in a car near the Notre Dame cathedral in central Paris.