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A typical scam at airports is for thieves, working in pairs, to cause a distraction at a security checkpoint (x-ray and arch) by setting off the metal detector just after an unsuspecting traveller has placed his/her bag on the conveyor, but immediately before he tries to walk into the arch. His transit is delayed, by which time an accomplice thief has stolen the laptop from the “air side” of the conveyor.
For precise details on how the scam works go to:
http://www.uniglobeisland.co.uk/site/viewhome.asp?aid=988&sit=87&vty=ARTICLE