Authorities found nothing suspicious on a plane headed from Boston to Miami that was emptied and moved to an isolated area at Logan International Airport after a written bomb threat was found on board.

The American Airlines plane and luggage was searched Wednesday by police and a bomb-sniffing dog.

Phil Orlandella, a spokesman for airport operator Massport, said the plane was given the all-clear around 4 p.m.

He said passengers on Flight 1318 were transferred to another plane and will continue to Miami.

The plane arrived from Dallas at about 1:45 p.m. and was scheduled to head to Miami about a half hour later.

During the preboarding process, a flight attendant found "Bomb on board, Boston-Miami" scrawled on a cabinet in the bathroom.

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