Shane Tamura, a former football player at Golden Valley and Granada Hills high schools, entered a New York skyscraper and began spraying bullets, police say.

The gunman who opened fire in a Midtown Manhattan office building left a note that appeared to blame the National Football League for his brain injury, New York Mayor Eric Adams said on Tuesday.

A gunman who killed four people when he stormed a skyscraper in the heart of New York on Monday evening left a note that appeared to blame the National Football League (NFL) for a brain injury, the city's Mayor Eric Adams has said.