The Waldo County Sheriff’s Office is seeking information about a young man seen at Fort Knox State Park soon after a bomb threat was discovered that prompted closure of the Penobscot Narrows Bridge Friday afternoon, May 28.

Waldo County Sheriff Scott Story said the bomb threat was a written one, which was discovered by staff at Fort Knox State Historic Site in Prospect. Story said the threat was “specific to the bridge facility itself,” but declined to provide additional details.

Late Friday, the Sheriff’s Office released a press release seeking information from the public. According to the statement, an individual described as a male in his late teens or early 20s was seen running from the park bathroom toward Route 174 shortly before the note was found. The individual is described as between 5-feet-8-inches tall and 5-feet-10-inches tall, slender build with light brown or reddish hair and wearing a dark blue T-shirt and black jeans.

A dispatcher at the Waldo County Regional Communications Center in Belfast said they received word of the threat shortly after 12:20 p.m. Friday.

The bridge was closed to traffic as soon as law enforcement officers arrived on the scene, according to the dispatcher. Story said officers from the Sheriff’s Office were joined by members of the Maine State Police, who brought an explosives-detecting dog to the scene.

Story said officers did a full search of the bridge and the associated facilities, and that nothing beyond the threat itself was found.

“The bridge has been opened back up and it’s business as usual,” said Story at about 2:45 p.m. Friday.

Fire and ambulance personnel from Prospect and Stockton Springs were called to the bridge, and also to divert traffic away from it while law enforcement officers did their work.

On the Waldo County side of the bridge, northbound traffic on Route 1 was turned around at the intersection with Muskrat Farm Road in Sandy Point. Drivers seeking to cross Route 174 were turned around at the intersection with Route 1A in the center of Prospect.

The Waldo County dispatcher said similar measures to divert traffic from the bridge were put in place on the Hancock County side.

The next-closest bridge across the Penobscot River runs from Bangor to Brewer, and for a little more than two hours, that route was the only option available for people trying to get from Waldo County to Bucksport, Ellsworth or points beyond in Hancock County.

Story said he was very thankful for the work done by fire and ambulance personnel in diverting traffic from the scene while the search was taking place. He said they do an excellent job with that work.

“Without their help, it would be a nightmare,” he said. “It wouldn’t be possible.”

Anyone with information about the incident or the individual described by police is asked to call the Waldo County Sheriff’s Office at 338-2040.