Authorities confiscated a gun owned by the St. Louis shooter Orlando Harris ahead of Monday’s attack at the Central Visual and Performing Arts High School, police said Wednesday. “[The family] contacted us and said he had a firearm, I believe it could have possibly been this gun,” said Interim St. Louis Metropolitan Police Chief Michael Sack during a news conference, adding that the AR-15 was transferred to an “adult who could legally possess one,” though it’s unclear who that person was. “The mother wanted it out of the house, so they facilitated it, the party had it. How he acquired it after that, we don’t know. We’re looking into it,” he said. According to officials, Harris’ family did “everything that they possibly could have done” to mediate his mental health struggles, including therapy, medication and committing him to psychiatric units. “That’s why the mother is so heartbroken over the families that paid for his episode,” Sack said. The school’s health teacher, Jean Kuczka, 61, and a student, Alexzandria Bell, 15, were killed during the shooting on Monday, along with Harris, who died during a gunfire exchange with police.