BOBIGNY, France: A security exercise gone wrong saw tempers flare in a Paris airport, after FedEx workers discovered fake explosive devices in a ripped package, sources said Thursday. Employees of the American courier service at Charles de Gaulle airport were shocked to find a pressure cooker filled with nuts and bolts inside a package in transit from the US to Tunisia. On further inspection they discovered a container of other similar devices, along with what appeared to be detonators, said Frederic Petit, who represents the company’s employees for the CGT union. A security source at the airport said the devices were actually decoys bound for the US embassy in Tunisia that were being used for a training exercise. Petit slammed the exercise as “irresponsible,” given the heightened security concerns since the Paris attacks in November, when jihadists killed 130 people.