MINNEAPOLIS (AP) — Delta Air Lines Inc. and the FBI are trying to figure out how needles got into turkey sandwiches served aboard four flights from Amsterdam. One passenger was injured.

The airline said that what appear to be sewing needles were found in five sandwiches on Sunday. One passenger on a flight to Minneapolis was injured, but the passenger declined to get medical attention, according to Delta spokeswoman Kristin Baur. The other needles were on two flights to Atlanta and one to Seattle.