A passenger on an Air France flight Monday said he knew something was amiss when a woman's carry-on bag started moving around by itself.
Flight attendants opened the bag and discovered a baby inside.
Now, French investigators say they're trying to determine why the woman decided to sneak the baby on board Air France Flight 1891, without a valid ticket for the child. The flight had already left Istanbul on its way to Paris.
Police didn't name the woman. The baby was 1 or 2 years old, Metro reports.
A witness told the French website planet.fr, "The cloth bag belonged to a woman sitting at the back. At one point, she wanted to open it and somebody on the neighbouring row of seats saw that something was moving inside." A crew member said the passenger who spotted the bag was "very shocked," Metro adds.