Just recieved this in an email
AIRPORT WARNING!
Last Saturday August 9th I had my wallet stolen right off the luggage scanner at the International Terminal of Soekarno-Hatta Airport. I had a porter to place two heavy items of luggage onto the first scanner prior to check-in, and I then placed my handbag (containing my wallet) and my carry-on bag onto the belt myself. My handbag was safely (I thought) nestled between a suitcase and my carry-on. I then proceeded to the walk-through metal detector and waited for my luggage on the other side. Three items of luggage appeared - and then there was a wait for my handbag, which then emerged, but not in the original position. Panicking at first, I was then relieved to see it, only to discover at the check-in counter that my wallet wasn't in the handbag anymore!
I returned to the security scanner staff to ask and complain loudly but no-one had seen anyone take anything - and no-one was particularly interested in listening to me. I could have missed my plane to report this to the police, but I decided it was more important to catch my flight. Luckily I was able to cancel my credit cards by phone, but I lost a lot of cash and other items.
The moral of the story: always wait until every item of your luggage has actually entered the X-ray machine before you proceed to the metal detector. There may be criminals watching your every move, and waiting to take advantage.