During the summer high season, the gang flies from airport to airport in Europe. They book cheap tickets and once inside the area in which hand luggage is checked, they observe other passengers, looking for potential victims that have put their rings, mobile phones, belts and watches into the plastic trays that go through the security scanners.
As the trays often pass through the security scanner more quickly than the passengers, they are sometimes left unattended for several minutes.
This gives the thieves the opportunity to do their worst.
The paper reports that a Belgian passenger travelling through the airport fell foul of the gang in mid-July. CCTV images show how his belongings were stolen by a couple that had been watching him for some time.
The pair is reported to have been travelling around Europe for some time on forged Mexican passports. The police have called on passengers to be extra vigilant at the airport.