The FBI has launched an investigation after needles were found in sandwiches served on Delta Air Lines flights, injuring a passenger.
The airline said what appeared to be sewing needles were found in five sandwiches on Sunday.
One passenger on a flight to Minneapolis was injured, but the passenger declined medical attention, said Delta spokeswoman Kristin Baur.
The other needles were on two flights to Atlanta and one to Seattle.
The FBI's Atlanta office has opened a criminal investigation into the matter, the agency said.
Ms Baur said flight attendants stopped serving the sandwiches as soon as the needle was discovered.
Messages went out to other flights en route from Amsterdam, where the sandwiches had been prepared by a catering company.
Another sandwich served on the Minneapolis-bound flight also had a needle, she said.
After the needles were found, passengers were served pizza instead.
"Delta is taking this matter extremely seriously and is co-operating with local and federal authorities who are investigating the incident," said the spokeswoman.
The sandwiches were made in the Amsterdam kitchen of catering company Gate Gourmet, and were to be served to business class passengers on Delta flights.