A flight en route to Charles de Gaulle airport in Paris made an emergency landing on Sunday after a bomb-like device was discovered in the bathroom.
The device was discovered aboard a flight out of Mauritius, which was diverted to Kenya where it made an emergency landing in the coastal city of Mombasa.
The device was made of cardboard, paper and a household timer. It has since been found to be a hoax.
"This object did not contain explosives," Gagey told reporters in Paris.
A passenger reported the device to members of the crew and that passenger is now reportedly one of those being interrogated.
Mauritius, an island nation in the Indian Ocean, is a popular destination for French tourists.
Those tourists, like many in France, are likely still rattled from the Nov. 13 Paris attacks that left 130 people dead.
ISIS has claimed responsibility for the gruesome attack. Since then, two Air France flights from the U.S. to Paris have been diverted due to bomb threats that proved to be hoaxes.