Amsterdam airport tightens security after sting

Amsterdam's Schiphol Airport - the departure site for the Detroit underwear bomber - tightened security Tuesday after journalists orchestrated a sting operation that smuggled bottles of liquids onto planes bound for London and Washington.

Security at Schiphol has been under scrutiny since Umar Farouk Abdulmutallab, a Nigerian student, flew from the airport to Detroit on Christmas Day with explosives in his underwear. Abdulmutallab allegedly tried to detonate the explosives over the United States before being grabbed by passengers and crew, AP reported.

In an undercover operation broadcast on television Sunday night, reporters refilled bottles bought at a duty free store, resealed them and smuggled them back into the store. They then went through the check-out counter again with the same bottles, where they were put into sealed plastic bags that were not checked by security staff.

The Netherlands National Anti-terror Coordinator says extra security staff will immediately begin patrolling duty-free stores at the airport and there will be more stringent checks on bottles bought there. Some stores will stop selling liquids altogether.

The stunt was possible because handbag security at Schiphol is conducted at boarding gates rather than before entering the departure lounge where the duty-free shops are located.