GREEN BAY, WI (WTAQ) - FBI authorities teamed up with the Brown County Sheriff's Department in checking out a bomb threat called in to Austin Straubel International Airport Saturday.

Airport Director Tom Miller says a cell phone call was made to 911 at 2:50 p.m. Saturday that a bomb would go off at the airport at 7 p.m.

As a precaution, Miller says all non-essential people inside the terminal were evacuated around 6:30 p.m., which also led to the cancellation of a United Airlines flight from Chicago's O'Hare Airport due to arrive at 7:05 p.m.

"The FBI gave the 'all clear' to return to the terminal at 7:30 pm, " said Miller.

Nothing was found, but Miller said air traffic control officials were relocated to the airport's public safety building.  Once the airport was reopened air traffic controllers and Transportation Safety Administration employees returned to their normal stations.

"You always have to consider it a real threat until you've been able to absolutely eliminate everything. I'd prefer to error on the side of safety, of course, and make sure that no one gets injured," said Miller.