It now seems that the French police are investigating whether a pickpocket stole thousands of euros from passengers as they slept on an Air France flight from Tokyo to Paris. A spokesman for the border police at Charles de Gaulle airport in Paris said that there is an investigation that is underway right now.

Local sources say that around 4,000 euros, or $5,744, appears to have been stolen from five business class passengers as they slept on the overnight flight. On this flight, which took off from Tokyo’s Narita Airport, passengers often sleep deeply before waking up shortly before arriving in Paris.

A woman finally alerted the cabin crew when she woke up to find a large sum of money missing. The passenger said that this lady called staff to say that all the cash in her handbag had been stolen. Counting Swiss francs, euros and yen. There was apparently about 3,000 euros.

A spokesperson for Air France said that the pilot had alerted the police who were waiting when the flight touched down in Paris. The spokesperson said that this is really an extremely rare event to have several passengers at once reporting thefts on board. She said that while the company was responsible for baggage carried in the hold, passengers are the ones that are responsible for items they carry into the cabin.

Right now the police have no leads on who the theft might be. However, some say that it would be very rare that a passenger would be able to steel so much money on a plane without anyone being able to see him.