A Dutch air traffic control spokeswoman said the plane was in German airspace when it turned back. A spokeswoman for Schiphol said the pilot had taken the decision to turn back but could give no further details.
Security has been increased at airports worldwide after British police said on Aug. 10 they had foiled a plot to blow up planes in the mid-Atlantic using liquid explosives disguised as drinks.
Dutch news agency ANP quoted police as saying a number of people had been taken off the Northwest plane and were being questioned.
Ah, Islamic extremists. During an election year there is one group we can take everything they say they will do as a promise. Unlike our politicians who make loads of claims, threats and 'campaign promises' that we know they will never keep.