Washington, D.C. -- Delta Air Lines says it found what appeared to be sewing needles in four turkey sandwiches on separate flights Monday.
The planes were traveling from the Netherlands to the Minneapolis and Seattle, and two were headed to Atlanta, according to a Delta spokesperson.
The airline told all 18 flights from Amsterdam to stop serving the sandwiches after passengers found two of the needles.
Later, two more needles were found, including one by a federal air marshal.
A passenger on the plane headed to Minneapolis was injured by the needle, but declined medical treatment when the plane landed, the spokesperson said.
Gate Gourmet, a company in Amsterdam, provided the sandwiches to Delta.
Delta is now serving sealed, pre-packaged food instead of the sandwiches.
The Transportation Security Adminstration says it notified all U.S. airlines traveling from Amsterdam to the U.S. of the needles.
Delta has been in contact with the FBI, local authorities and Gate Gourmet, and is cooperating with all investigations.