The explanation for a shooting rampage that terrorised a black neighbourhood in the US state of Oklahoma and left three people dead may lie in a killing that took place more than two years ago, it has been revealed.

Two men have appeared in court on accusations they were behind a series of shootings in Oklahoma that left three people dead.

Police in Oklahoma have arrested two white male suspects over shootings that left three people dead and two more critically wounded, all black, in the Tulsa area.