The same office was shot at a week prior, according to investigators.
Police in Tempe, Arizona, responded to the office, which the local Democratic Party also uses, after they received calls from staffers about the damage. At least five bullet holes were found in the windows and the door.
Tempe police said they were analyzing evidence and were taking “additional measures” after the shooting “to ensure the safety of staff and others in the area.” A motive for the shooting has not yet been determined and the investigation continues, according to the police.
The same office was shot at just a week prior, on Sept. 16, in an incident the police said appeared to involve a BB or pellet gun. That shooting also happened just after midnight and caused “criminal damage,” according to the police.
Law enforcement around the country is under heightened alert over an increase in political violence threats.
Harris is scheduled to visit Arizona on Friday.