An Uber driver who’s accused of going on a shooting spree Feb. 20 that left six people dead told police that the Uber app took over his body and apparently controlled his actions, according to a report by Grand Rapids, Mich., ABC station WZZM-TV.

Jason Dalton reportedly told authorities that the app “has the ability to take you over.” He also said, “When I logged onto site [the Uber app], it started making me feel like a puppet,” according to the report, which cites documents obtained from the Kalamazoo County Sheriff’s Department.

“Dalton, a relatively new driver with Uber at the time, said the app controlled him like it was an artificial presence,” the story reports. “The system would switch from black to red — and when it switched back, that’s when ‘Dalton got his presence back.'”

The report adds: “He elaborated to police that all his problems started when he pressed a button on the screen and a devil head popped up. It appeared like a horned cow head, and then it would give provide an assignment that would ‘literally take over’ your body, Dalton told police.”

The shootings on the night of Feb. 20, 2016, reportedly left six people dead and two others injured. The shootings took place at an apartment complex, outside a restaurant and at a car dealership in Kalamazoo County.

Dalton, 45, was arrested just after midnight on Feb. 21. Authorities have indicated that Dalton, who reportedly confessed to committing the shootings, has no known criminal history or mental health record.