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Delta is taking this matter extremely seriously and is cooperating with local and federal authorities who are investigating the incident. Delta has taken immediate action with our in-flight caterer at Amsterdam to ensure the safety and quality of the food we provide onboard our aircraft,” the airline said in a written statement.

Benno Baksteen, a former Dutch pilot and aviation safety expert, said food is transported to aircraft amid tight security, “for obvious reasons — because people can hide stuff in catering trolleys.”

He said trolleys carrying prepared airline food are sealed in transport, “so the most likely place where it could have happened would be in the place where it’s manufactured or, of course, before it’s served, once the trolleys are opened.”

Schiphol Airport staff referred questions about security surrounding catering companies to the Dutch Ministry of Security and Justice, which oversees aviation security. A spokesman at the ministry was not immediately available for comment.

Ton Scherrenberg, chairman of the VNC union, which represents some 7,000 Dutch cabin personnel, told the AP that cabin crews check food trolleys for foreign objects when they open them on board aircraft, “but you can’t check every single sandwich.”

He said he knew of no other such incidents at Schiphol in the past.