The white gunman accused of a racist rampage at a Buffalo supermarket planned to keep killing if he had escaped the scene, the police commissioner said Monday, as authorities investigated the massacre of Black people as a potential hate crime or act of domestic terrorism.

The gunman, who had crossed the state to target the Tops Friendly Market, where he killed 10 people, had talked about shooting up another store as well, Buffalo Police Commissioner Joseph Gramaglia told CNN .

He was going to get in his car and continue to drive down Jefferson Avenue and continue doing the same thing, the commissioner said.