The FBI is investigating how needles ended up in sandwiches served on four Delta Airline flights from Amsterdam to the US on Sunday.

The sandwiches were produced by Amsterdam catering company Gate Gourmet, which has launched its own investigation into the incident.

Needles were found in five turkey sandwiches on flights to Atlanta, Seattle and Minneapolis. As soon as the needles were discovered, flight crew replaced the sandwiches with pizza, news agency AP reported.

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