SEATTLE -- The FBI is asking for the public's help identifying two men who they say have been exhibiting unusual behavior on Washington state ferries.

FBI spokeswoman Robbie Burroughs said the men have been reported by passengers and, while their behavior may have been innocuous, investigators would like to talk to the men.

Burroughs said the men appeared to be taking an unusual interest in the workings of the boat, but she would not elaborate.

Passengers and crew members on different runs on separate dates reported the men to authorities.

Investigators would not disclose on which ferry runs the men were seen.

Anyone with information about the men is asked to call the FBI's Seattle office at 206-622-0460.