An American man who crashed a stolen lorry into a house before shooting two black bystanders was a suspected white supremacist, police say.
Nathan Allen, 28, fatally shot retired policeman Dave Green and military veteran Ramona Cooper in Saturday afternoon's attack in Massachusetts.
Investigators later found racist and anti-Semitic writings by Allen, who was shot dead by officers at the scene.
He was married, employed and had a PhD and no criminal history, police said.
According to CBS affiliate WBZ-TV, Allen walked through a marsh to a garage in the city of Winthrop where he stole a plumber's lorry. He crashed the vehicle into an unoccupied home, causing extensive damage.
He then climbed out of the wreckage and attempted unsuccessfully to carjack another vehicle.