Chief Alfonso Morales said in a statement Wednesday he does not believe racial issues led 51-year old Anthony Ferrill to carry out the attack, in which he shot and killed five people before turning the gun on himself.
RELATED: Molson Coors mass shooting victims, suspected gunman ID'd as Anthony Ferrill, Milwaukee police say
Morales said Ferrill had been friendly with some of the victims, according to WISN.
"Various sources have reported that the suspect's actions were racially motivated and that he was directly impacted by racism while working for the company," the statement said. "Detectives have interviewed several witnesses regarding the suspect's actions and statements leading up to the incident."
Police said they do not believe any of the victims were targeted.
"As a result of the preliminary investigation, neither race nor racism has been identified as a factor in this incident," the statement said.
RELATED: Molson Coors brewery in Milwaukee reopens Monday after 5 employees killed in mass shooting
Molson Coors in Milwaukee reopened Monday, with increased security and counselors available.
"We have begun the healing process after this unimaginable tragedy, but it will take time," spokesman Adam Collins said.
Beer production resumed Thursday.