The gunman who killed nine people outside a bar in Dayton, Ohio, had cocaine, Xanax and alcohol in his system at the time of the shooting rampage, the county coroner said on Thursday. Dayton police announced the findings at a press conference and on Twitter and said that two victims of the massacre were struck by gunfire from law enforcement officers responding to the scene. “While it weighs heavily on us that our response caused harm to these victims, we are comforted that none of our rounds caused the death of any of these innocent people,” Dayton Police Chief Richard Biehl said on Twitter. Dr. Kent Harshbarger, Montgomery County coroner, said at the news conference that an autopsy conducted on the body of 24-year-old Connor Betts found the drugs and medication in his system. It was not clear how much of each drug was present at the time of the attack. The Aug. 4 massacre, which ended when police shot and killed the gunman, was one of three mass shootings over three weeks that stunned Americans and stoked a long-running debate over gun rights. Earlier this week a friend of Betts, 24-year-old Ethan Kollie, was charged in federal court with lying his drug use on a form he filled out to buy a gun and with possession of a firearm by an unlawful user of a controlled substance.