Washington ( CNN ) -- The FBI says it has launched an investigation into the discovery of sewing needles in four turkey sandwiches on separate Delta Air Lines flights from Amsterdam to the United States . The objects were discovered in food on planes as they were en route Sunday from Schiphol Airport in the Netherlands to Minneapolis , Seattle and two flights to Atlanta , according to Delta spokeswoman Kristin Baur . Two of the needles were found by passengers , she said , at which point Delta told all 18 flights from Amsterdam to stop serving the sandwiches . Unsavory truths about airplane food . Two more needles were discovered , including one found by a federal air marshal . One passenger on the plane going to Minneapolis was injured by the needle but declined medical treatment upon landing , according to Baur . Federal agents have begun a criminal investigation , said Special Agent Stephen Emmett , an FBI spokesman in Atlanta . Gate Gourmet , which provided prepared sandwiches to Delta , said the sandwiches originated at the firm 's facility in Amsterdam . The company has been in business since 1992 . `` This is a terribly upsetting situation , '' said Gate Gourmet spokeswoman Christina Ulosevich . `` First and foremost is the safety of the traveling public . There 's nothing more important to us at all than the safety of the passengers and crews . '' Delta is now serving sealed prepackaged food on these flights instead of the sandwiches , and no other needles have been found , Baur said . Airline drops salads from flights in food scare . The Transportation Security Administration says it notified all U.S. airlines with flights from Schiphol to the United States of the findings . `` TSA continues to closely monitor the review of the incidents as well as the security protocols being conducted by the air carrier and the airport authority , '' spokesman David Castelveter said . `` Delta requires all its in-flight caterers to adhere to strict criteria in order to offer our customers the very best onboard meals , '' Baur told CNN in a statement . `` The safety and security of our passengers and crew is Delta 's number one priority . '' Delta says it has been in contact with the FBI , authorities in the Netherlands and Gate Gourmet and is fully cooperating with them in this investigation . Why air travel snacks matter . Asked whether Gate Gourmet had taken any job action against any employee , Ulosevich said , `` We do n't have any comment . It 's part of an active investigation . '' `` We are absolutely cooperating fully with federal and local authorities who are involved , and concurrent with that , we 'll be conducting our own full-scale investigation . '' Ulosevich said the company provides food to other airlines , `` but we have received no other reports '' of tampered products from other customers . `` We are monitoring every aspect of our operation , '' she said . Have you had a bad experience with food during your flight ? Share with us in the comments below . CNN 's John Branch contributed to this report .
Delta says needles were found in sandwiches on four flights to the U.S. All four flights originated at Schiphol Airport in Amsterdam . One passenger was injured but declined medical treatment , the airline says . The food company , Delta , the FBI and authorities in the Netherlands are investigating .