According to Delta, the contaminated sandwiches were turkey sandwiches that were served in the business elite cabin to a small number of passengers. Since the incident, turkey sandwiches have been removed from flights out of Amsterdam and have been replaced by pre-packaged pizza, said Delta.
"Delta is taking this matter extremely seriously and is cooperating with local and federal authorities who are investigating the incident," Delta spokeswoman Kristin Bauer said in a statement to ABC News. "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."
Delta told authorities that Gate Gourmet, a U.S. company operating in Amsterdam, made the sandwiches.
Gate Gourmet said it is treating the incident "as a criminal act."
"Gate Gourmet immediately launched a full investigation to determine the root cause of this disturbing incident, and we are treating this as a criminal act," Gate Gourmet spokeswoman Christina Ulosevich said in a statement. "Nothing is more important to Gate Gourmet than the safety and well-being of the traveling public. The company also is cooperating fully with investigations by local and federal authorities and by our customer."
Although federal air marshals were aboard the flight, they were not notified of the incident by the crew, authorities said, until deplaning. At that point the air marshals turned the incident over to the FBI, which was working with CBP and local police to investigate how the needles were put in the meat.
In addition to the Minneapolis flight, a needle was discovered by a teenage passenger aboard a Delta flight from Amsterdam to Atlanta. The teen would not surrender the needle to authorities, who noted he told them that he planned to use it as evidence in a lawsuit.
In a federal report on the incidents, it was noted that the teen was the son of a passenger aboard the flight to Minneapolis who also found a needle in his sandwich.
Additional needles were reported found on two other flights, one by a crew member and another by a federal air marshal.
Intellpuke: You can read this article by ABC News correspondents Richard Esposito and Mark Schone in context here: abcnews.go.com/Blotter/needles-found-sandwiches-delta-flights/story?id=16790585#.UAXA9pHh7No