Antioch Waffle House shooter Travis Reinking was previously arrested and later released by the U.S. Secret Service outside the White House in July, 2017, the Tennessean reports. The Secret Service gave the guns to his father, who later gave them back to him.

Reinking is still at large after he fatally shot four people and wounded four others before being disarmed by James Shaw Jr. The police are expected to charge him with murder.

Police confirmed the identities of the four people killed:  Waffle House employee Taurean C. Sanderlin, 29, of Goodlettsville; Joe R. Perez, 20, of Nashville; Akilah Dasilva, 23, of Antioch; and Belmont University student DeEbony Groves,  21.

Police said at a press conference on Sunday afternoon that they suspect Reinking of having “mental issues.” He was previously interviewed by the FBI and the Sheriff’s department in Illinois over past incidents.

Metro Nashvile Police Department acknowledged the weapons tied to Reinking — an assault rifle and a handgun — “would not lawfully have been possessed” under Illinois state law, though lawful in Tennessee.

Police believe Reinking is currently on foot and urged locals to remain vigilant and on alert.