A security issue at Bluegrass Station prompted a heavy emergency response, but crews found no threat to the area.

Crews evacuated part of the facility as a result. The site is near the Fayette-Bourbon County line.

Bluegrass Station director Stephen Collins says two people were in a commercial vehicle and didn't have credentials to get on campus. Security stopped the two outside the property. It was later determined that they were employed by an outside company to haul items away.

Employees tell WKYT they were on break when they were instructed to take shelter. They thought it was a drill, but a manager would later tell them they needed to evacuate. Hundreds evacuated the building. Collins said leaders felt the need to evacuate the employees after clearing buildings near the vehicle.

Crews found nothing suspicious inside the vehicle. The two people are being released.

The normal security protocol to enter Bluegrass Depot is pulling up to a gate and having a guard verify your identification.

The FBI responded to the scene along with state and local authorities.

Bluegrass Station is a state-owned campus on Briar Hill Road which is home to government and private industry tenants, including Lockheed Martin. The defense company says it employs thousands at the military industrial park.

The site is a former Army post before it was purchased by the state in 2008.