A suspicious device found on an Air France flight from Mauritius to Paris that prompted an emergency landing was harmless and caused a "false alarm", the airline's chief executive said on Sunday.
Air France staff decided to land the Boeing 777 at the nearest airport, in the Kenyan port city of Mombasa, after a passenger found the object in the toilets late on Saturday and alerted crew, CEO Frederic Gagey said.
"All the information available to us at the moment indicates that the object was not capable of creating an explosion or damaging a plane," Gagey told a news conference in the French capital. "It was a false alarm."
Mombasa County Commissioner Nelson Marwa said passengers had departed on another plane sent by Air France to pick them up. An undisclosed number who were being questioned by authorities had stayed behind, but he did not say if they were under arrest.
"They are now airborne, but a few among them who we were interrogating have remained with us, until ongoing investigations are done. We are still interrogating them," Marwa told Reuters by phone.
"This is a collaborative investigation involving Kenya and Mauritius, and when we are through, the plane involved will also be released."
Air France said it planned to take legal action over the incident, without giving further details.
The 459 passengers and 14 crew on board flight AF463 were evacuated using the emergency slides after the plane landed at 2136 GMT.
The device was retrieved from the aircraft by explosives experts from the Navy and DCI (Directorate of Criminal Investigations), Police Inspector General Joseph Boinnet said earlier on his Twitter account.
Kenyan Interior Minister Joseph Nkaissery told reporters at Mombasa's Moi International Airport on Sunday that the authorities were in touch with Mauritius to find out how passengers had been screened.