FORT COLLINS, Colo. -- Two state employees are OK after being held hostage by a knife-wielding truck driver at a weigh station on Interstate 25 in Larimer County.

The two workers were briefly held at knifepoint Tuesday after they instructed the driver to park his truck overnight, the Colorado State Patrol said. The trucker was issued a citation and told that he couldn't have access to the truck until 7 a.m., Fort Collins police spokeswoman Rita Davis said.

The workers were rescued without injury after they called the weigh station across the road and alerted them, said Mark Couch, spokesman for the Colorado Department of Revenue.

Samuel Ervin Brown, 49, of Columbia, S.C., was taken into custody without incident by Fort Collins police at 9:40 p.m.

Brown now faces two charges of kidnapping.

The standoff, which last roughly 10 minutes, occurred at the port of entry station in Fort Collins, on northbound I-25.

Couch couldn't tell 7NEWS why Brown was asked to park his truck for the night but said it is often because the driver has been on the road for more hours than are allowed by law or that the trucker's log books aren't in order.