A worker at a U.S. Postal Service Office in St. Paul was shot and injured Sunday and police said they arrested a coworker of the victim. Police were called shortly before 3:30 p.m. on a report of a person shot in the building on West Seventh Street, just west of Interstate 35E, which is closed to the public on Sundays. Officers found a man with multiple gunshot injuries, and St. Paul Fire Department medics took him to the hospital with life-threatening injuries, according to Sgt. Mike Ernster, a St. Paul Police spokesman. Police found the suspect about 4:50 p.m. and arrested him during a traffic stop in the area of West Seventh and Madison streets, just over a mile from the post office. Preliminary information shows the victim and suspect know each other as coworkers, Ernster said. Police are investigating the circumstances of the shooting. Related Articles Crime & Public Safety | St. Paul sees second homicide this weekend with shooting death Saturday night Crime & Public Safety | Nonfatal shootings usually have a low solve rate. St. Paul police focus on reversing that trend Crime & Public Safety | Man dies after Lowertown St. Paul stabbing Crime & Public Safety | Derrick Thompson found guilty of fentanyl, firearm charges in connection with Minneapolis crash that killed five Crime & Public Safety | St. Paul boy shot on New Year’s Eve ‘stripped of his sense of security,’ mother says at shooter’s sentencing