American and Dutch authorities are investigating how needles got into five turkey sandwiches served on four flights from Amsterdam to the U.S.

Passengers bit into the sandwiches Sunday on Delta Air Lines flights bound for Minneapolis, Atlanta and Seattle. One person was injured but declined treatment.

The U.S. Federal Bureau of Investigation said Tuesday it has launched a criminal investigation along with Dutch police. The sandwiches were prepared in the Amsterdam kitchen of an airline catering company, Gate Gourmet.

One of the passengers who bit into a sandwich with a needle, James Tonges, told a U.S. television interviewer (ABC) he felt its sharp point in his mouth.

“I felt the poke in the top of my mouth. When i pulled it out of my mouth, it was very clear. I cleaned the food off, and it was, it was about a one-inch-long straight needle.”

Once the needles were found, the passengers were served pizza.

Delta said it is taking the matter “extremely seriously,” and Gate Gourmet called the incident “a terribly upsetting situation.”