BBC World Service just told us that French airport security forces, in a security exercise to train and/or test explosive-sniffing dogs, planted plastic explosives in random pieces of real outgoing luggage, intending of course to remove them all before they were loaded on planes.
Unfortunately one of those pieces of luggage got away. French airport security has sent out an all-points alert to the world's airports that an unsuspecting passenger is carrying explosives he or she knows nothing about.
The luggage is blue.
Just amazingly dumb.