Man ‘killed parents before firing on motorists’

A sheriff’s department caution tape is set up at the entrance of a crime scene in Bowdoin, Maine (Rodrique Ngowi/AP)

A man confessed to killing four people, including his parents, and then firing on motorists on a busy interstate highway, just days after being released from prison, US police have said.

Law enforcement officials released more information, including identities of the victims of the shootings on Tuesday at a home in Bowdoin and 25 miles to the south on the highway in Yarmouth, Maine.