An Alpine man admitted to intentionally setting a U.S. Post Office on fire Thursday.

According to a release from the United States Attorney's Office, Karl Henry Peterson, 59, admitted to setting the Alpine post office on fire last year.

Peterson pleaded guilty to one count of arson involving a federal facility. By pleading guilty, Peterson admitted to setting the U.S. Post Office on fire on October 12, 2016.

Peterson remains in federal custody and faces a 37-month sentence in federal prison.

Several law enforcement agencies investigated the case, including the U.S. Postal Inspection Service, the Texas State Fire Marshal's Office and the Alpine Police Department.