An Air France flight from Mauritius diverted and made an emergency landing at Kenya's port city of Mombasa after a suspicious device was found in a toilet, Kenya's head of police and the airline said on Sunday.

Police Inspector General Joseph Boinnet said on his Twitter account that the Boeing 777 aircraft headed to Paris with 459 passengers and 14 crew, was safely evacuated after it landed at Moi International Airport at 12:37 a.m. on Sunday.

"Bomb experts from the Navy and DCI (Directorate of Criminal Investigations) have retrieved the device and are determining whether the components contained explosives," Boinnet said.

Air France said in a statement that as a precaution, all passengers were evacuated from the aircraft by its emergency slides.

"They are (being) taken care of by Mombasa's airport ground staff and will be accommodated. An investigation is being led by the authorities to identify the source of the threat," it said.

The airline said it was working to re-route is passengers and was sending another plane to Mombasa to fly them to Paris.

"This Mombasa - Paris flight is scheduled to leave in the late afternoon of Sunday, December 20," it said.

Kenya Civil Aviation Authority said on its Twitter account that flights from Mombasa airport were disrupted due to the emergency landing.