A Tucson police lieutenant was demoted after she took sexually explicit videos, and a provocative photo of herself wearing her police uniform shirt, and sent them to a subordinate officer with whom she was in a relationship, department officials said Monday.

Lt. Diana Lopez, a former public information officer for the Tucson Police Department, was reduced to the rank of sergeant following an investigation that began in last August. Anonymous letters sent to the department and the City Attorney's Office about Lopez prompted the probe, according to a departmental report made public Monday. The internal affairs investigation found that Lopez sent photographs and videos using her personal cell phone to the subordinate officer, whose name was not released.