CASPER, Wyo. (AP) — Sinclair police are investigating a report of damage to valves at the Sinclair Oil Corp. refinery near Rawlins.

Company spokesman Clint Ensign tells the Associated Press the damage was an intentional act and could've eventually caused a compressor unit to shut down. Workers discovered the damage Oct. 18.

Sinclair Police Chief Jeff Sanders confirmed Wednesday that his department is investigating the matter. He declined to comment further.

Wyoming Occupational Safety and Health Administration spokeswoman Hayley Douglass says her agency sent investigators to the refinery to check the unit after the report of damage. She said the FBI also was investigating. An FBI spokesman didn't confirm or deny an investigation.

Ensign says the damage doesn't appear to be terrorism.