FedEx workers found bombs that were later revealed to be fake at Paris' Charles de Gaulle Airport.

Agence France-Presse reported Thursday that the workers found a ripped package containing a pressure cooker packed with nuts and bolts heading from the U.S. to Tunisia.

A union rep for the workers, Frederic Petit, told AFP that similar devices and what appeared to be detonators were found in a container.

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Authorities were called to the airport, bringing sniffer dogs and X-ray machines to examine the devices.

A security source told AFP that the devices were fake and were heading to the U.S. Embassy in Tunisia for a training exercise.

"This type of delivery is not common, but sometimes takes place," the source told AFP. "This is just the first time that a package has been opened."

A FedEx spokesman confirmed the incident in a statement to CBS News.

"A FedEx employee flagged the shipment. Its contents were authorized under applicable security regulations and did not pose any safety or security risk," the spokesman said.

Petit told AFP that workers want these kind of deliveries banned from going through France.

"Nobody was aware of this cargo," he said.