Police say an 8-year-old boy has died after being struck by a metal arm that opens a gate in a suburban Las Vegas housing community.

The arm that opens and closes the automatic gate moves back and forth in a space that the boy was known to play in.

North Las Vegas police spokeswoman Chrissie Coon says the boy was apparently crawling through the space that's 7 inches tall and nearly 3 feet wide Tuesday afternoon when another child on a bicycle approached the gate, triggering a motion sensor for it to move.

Coon says a teenager who saw the bar hit the boy called 911, reporting that the boy was stuck in the gate and suffered a severe injury.