NEWARK, N.J. >> Authorities say a stun gun found aboard a JetBlue plane that landed in Newark last week resembled a cellphone.

Bryan Travers, a spokesman for the FBI’s Newark office, says it did not appear the device was intended to be used in an attack. Travers also said no law enforcement official was seated where the stun gun was found.

The FBI’s office in Boston is leading the investigation into how the stun gun got onto the plane.

Port Authority spokesman Steve Coleman says a police report indicates cleaning crews found a black stun gun in a black case resembling a cellphone. There were no indications it had been fired.

The crew was cleaning Flight 1179 from Boston on Friday night after the flight had landed and all 96 passengers were off the plane.

Port Authority of New York and New Jersey police removed the stun gun from the plane and handed it over to the federal Transportation Security Administration, which is responsible for screening passengers.

JetBlue spokesman Sebastian White said the plane’s next flight was slightly delayed.