A 17-year-old Massachusetts teenager is accused of killing his mother and younger brother, authorities say. NBC News reports the teen allegedly murdered his mother and brother after using artificial intelligence to search for ideas or fantasy stories related to killing his family.

Both outlets describe the case as involving AI-generated violent “fantasies.” The Oregonian says the accused’s search activity involved months of AI-generated violent family murder fantasies, while NBC News characterizes the conduct as theoretical ideas or fantasy stories about killing his family. The reports do not indicate that the AI system is alleged to have provided direct instructions, but instead describe its use in connection with violent content the teen sought.

The accounts focus on the alleged link between the teenager’s AI activity and the killings, while other case details and the specific evidence described by authorities are not fully laid out in the excerpts provided by the outlets.