The suspicious device discovered in the bathroom of an Air France flight was a hoax, the CEO of Air France said Sunday.

The Boeing 777 was heading to Charles de Gaulle airport in Paris from Mauritius when its pilots requested an emergency landing early Sunday at Kenya's coastal city of Mombasa.

The device was made of cardboard, paper and a household timer, said Frédéric Gagey, the head of Air France.

"This object did not contain explosives," said Gagey at a news conference in Paris.

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Frédéric Gagey, Chairman and Chief Executive Officer of Air France, said the device didn't present danger to the flight or passengers. (Philippe Wojazer/Reuters)

Gagey congratulated the crew for their cool-headed reaction to divert the plane. A safety check was carried out in the bathroom before the flight, he said. He denied any security failure in the flight, saying that passengers are checked and sometimes double-checked on flights.

Six passengers are being questioned over the incident, said a Kenyan police official, who is part of the investigation and who insisted on anonymity because he is not authorized to speak to the press.

A passenger reported the device to the cabin crew who informed the pilots leading to an emergency landing at the Moi International Airport in Mombasa. One of those being interrogated is the man who reported the package.

The plane was carrying 459 passengers and 14 crew members on board and had left Mauritius at 9 p.m., said Kenyan police spokesmand Charles Owino. All passengers were safely evacuated and the device was taken out, said Owino.

"All the information available to us at the moment indicates that the object was not capable of creating an explosion or damaging a plane, but was rather a mixture of cardboard, sheets of paper and a timer," Gagey said. "It was a false alarm."

A passenger who spoke to journalists after leaving the plane in Mombasa described the emergency landing.

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The Air France Boeing 777 flight 463 from Mauritius to Paris made an emergency landing at Moi International Airport in Mombasa, Kenya Sunday, Dec. 20, 2015. (Edwin Kana/Associated Press)

"The plane just went down slowly, slowly, slowly, so we just realized probably something was wrong," said Benoit Lucchini of Paris.

"The personnel of Air France was just great, they were just wonderful. So they keep everybody calm. We did not know what was happening," said Lucchini. "So we secured the seat belt to land in Mombasa because we thought it was a technical problem but actually it was not a technical problem. It was something in the toilet. Something wrong in the toilet, it could be a bomb."

The Indian Ocean island of Mauritius is a popular destination for French tourists.

3rd plane diversion in recent weeks

Flight 463 is Air France's third plane to be diverted in recent weeks.

Two other Air France flights from the U.S. to Paris were diverted on Nov. 18 after bomb threats were received but no bombs were found on the planes from Los Angeles and Washington, D.C.

France has been under a state of emergency since the Nov. 13 attacks in Paris that left 130 people dead and hundreds wounded.

ISIS has claimed responsibility for the attacks in Paris as well as for the Oct. 31 crash of a Russian passenger plane in the Sinai desert that killed all 224 people aboard. Moscow says that crash was caused by a bomb on the plane and has demanded that Egypt increase security at all its airports.

'I was very distressed'

Steven Ciaran, 30 an Irishman working on Reunion Island, said he was seated at back of the plane watching a movie when he noticed the rushed movement of cabin crew preparing emergency drills. Cabin crew told him it was a technical problem and they created a calm environment among the passengers.

"I was very distressed because I could see we were far from the destination," said Ciaran. He said passengers reassured each other.

"I thought the plane had difficulty and not that it had anything to do with terrorism," he said.

The plane arrived in Mombasa at around 1.30 a.m. and the passengers disembarked using emergency slides, he said. A couple of people got twisted ankles but no one seriously injured, Ciaran said.

Ciaran says he was travelling from Reunion to Dublin for the Christmas holiday.

with files from Reuters