Edwin Kana/AP
December 20, 2015 11:45 AM

A “false alarm” following the discovery of a suspicious item on a Paris-bound Air France flight nonetheless led the plane to be diverted Sunday to Mombasa, Kenya, according to CNN, Reuters and Kenyan officials.

The item, found in a restroom, turned out to be a cardboard box with paper inside and “something like a kitchen timer” – not capable of exploding – Air France CEO Frederic Gagey said at a news conference Sunday afternoon, according to CNN.

He said the airline would investigate as to who had left the box behind, according to CNN.

“We find this behavior stupid and one that causes damage that is completely unacceptable,” Gagey said, according to CNN.

AF463 landed at Mombasa at about 12:30 a.m. local time, having departed from Mauritius for the French capital, the airline said via Twitter.

All passengers were safely evacuated in Mombasa, according to CNN. The 473 stranded passengers and crew would travel onto France within hours.

The box’s discovery and subsequent scare did not indicate security lapses because the item did not actually contain an explosive and could not have been detected in a security screening, according to CNN.

Air France said it would reinforce security in Mauritius, according to CNN.

The Ministry of Interior and Coordination of National Government in Kenya announced via Twitter that several passengers were being interrogated after they had discovered the item.

France has become more and more vigilant this year in the wake of multiple terror attacks: first in January, which killed several staff members of the satirical newspaper Charlie Hebdo, among others; and then in November, killing more than 100 across multiple public places in metropolitan Paris.

An Air France representative did not immediately respond to inquiries from PEOPLE.

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