Authorities have determined that "sharp force injuries of the neck" caused the deaths of three men at 12 Harding Ave. earlier this week., according to the Middlesex County District Attorney's Office.

The killings of Brandan Mess, 25, of 12 Harding Ave., Raphael Teken, 37, and Erik Weissman, 31, both of Cambridge were ruled a homicide earlier this week, after their bodies were discovered Monday afternoon.

Authorities have not said whether they are looking for suspects, but have said two other men were in the apartment prior to the murders. Authorities have said the killings were targeted and not a random act of violence.

The Middlesex County District Attorney is continuing to investigate the case, along with Waltham and State Police.