NEWARK - An FBI spokesman says there's no indication that an attack was imminent using a stun gun found in a plane that landed in Newark after a flight from Boston, Ma.

Federal authorities say the investigation is focusing mostly on how the stun gun ended up on the flight. The stun gun was found in the pocket behind a seat on a JetBlue plane around 10:20 p.m. Friday by a cleaning crew.

JetBlue released a statement earlier saying, "The crew discovered what they deemed to be a suspicious object in a seatback pocket. The TSA came onboard the aircraft and initiated an investigation into the matter."

Authorities say they gave it to the Port Authority of New York and New Jersey police, who handed it over to the Transportation Security Administration. The TSA is responsible for screening people before they board flights.

AP wire services contributed to this report.