(CNN)--Authorities are trying to find out how a stun gun ended up on a JetBlue plane in New Jersey Friday night.
An airline crew found the stun gun in a seat pocket after it landed at Newark Liberty International Airport.
The plane came from Boston, but made several stops during the day.
Nearly one hundred passengers were on the plane.
JetBlue officials turned the stun gun over to police.
The F-B-I and the Transportation Security Administration are investigating the incident.
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