A Tucson police officer fired his duty weapon early this morning while attempting to detain two suspected thieves downtown.

Just before 12:30 a.m., the Tucson Police Department received a call on its radio frequency from the Union Pacific Railroad police asking for assistance in arresting two men who entered the fenced rail yard at 445 S. Toole Ave. to steal a large spool of copper wire, Sgt. Chris Widmer, spokesman for the TPD said.

A TPD officer found the suspects, who left without the wire, almost half a mile away, walking along East Mill Street.

“The officer confronted the two suspects and ... fired at least one round from his duty weapon toward the suspects,” Widmer said.

No one was injured and both suspects were taken into custody by the TPD officer, with the help of the Union Pacific police officers.

As is standard in all officer-involved shootings, members of the homicide and internal affairs units are investigating the incident, Widmer said.

The story continues to develop. Check back for updates.