The state’s criminal investigation unit announced Thursday afternoon that it has begun an investigation involving Tom Jennings, Waterloo chief of police.

The Iowa Division of Criminal Investigation was asked by the Black Hawk County Attorney’s Office to investigate after a complaint was lodged by a local citizen. Officials with the DCI have stated that the incident in question happened on the evening of Aug. 20 in Waterloo, but have otherwise declined further comment in connection with the case.

Television station KWWL, headquartered in Waterloo, has reported that the investigation is in connection with an alleged physical altercation that involved Jennings and a 16-year-old male resident in the Chief’s westside neighborhood.

Police in Waterloo have been under pressure to solve and stop a rash of gun and possible gang-related violence that has taken a foothold in the community since April. On a single Tuesday in late July, police were called to investigate four shootings in different parts of the city. During a community forum last month, Jennings encouraged residents to come forward and tell what they knew in relation to the violence.