FBI Investigates Unidentified Series of False Threats on Passenger Jets

Anonymous suspect threatened 10 flights, saying there was a chemical device on board.
1:19 | 05/26/15

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Transcript for FBI Investigates Unidentified Series of False Threats on Passenger Jets
Tonight, the FBI is investigating a series of false threats. Ten passenger jets landing. This one at JFK. The passengers never knowing that their plane had been trailed by fighter jets. Authorities now warning there will be serious con consequences for anyone making these threats. Here's ABC's David Kerley. Reporter: The FBI tonight is looking for the anonymous suspect responsible for this. Air France 22, shut down at your discretion, you're going to be there for a while. Okay, shutting down engines. Reporter: An air France jet surrounded at JFK. As it approached the U.S., fighter jets scrambled and watched from a distance as the jetliner landed. Just one of about ten flights in which an unidentified caller made a threat to local authorities about a chemical device on board. Jets landing at five different airports, all fakes. The FBI has to take every one of these seriously? They almost don't have any choice, particularly if the plane is in the air. What are you going to do? You are going to search it. Reporter: Tonight, the FBI is trying to trace back the phone caller. Was the call made in the U.S. Or overseas? Is that person linked to an organization, or just an individual? You actually want to charge them. This cost hundreds of thousands of dollars and they have to send a signal out, if you do this, we are going to lock you up. Reporter: Causing havoc, threatening a jetliner can mean five years in prison. David Kerley, ABC news, Washington.

This transcript has been automatically generated and may not be 100% accurate.

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