Crew members on a Navy Pier cruise ship found two notes Wednesday saying a bomb would explode, police said.
The FBI, Chicago Police and bomb-sniffing dogs checked the Spirit of Chicago and around the area, finding no threat, according to the Chicago Tribune.
An envelope was found around 3:45 p.m. when only staffers were aboard the Spirit of Chicago ship, the Tribune reports. Police found the second note during a search.
No one was hurt. The envelopes and notes are being examined, police said, and the investigation is ongoing.
Evening cruises were moved to another Navy Pier ship.