Runaway golf cart injures U.S. Open spectators in freak accident

Four spectators were injured after a box fell onto the accelerator of a golf cart during the second round of the U.S. Open.

There was a dangerous scene near the 16th hole at Pebble Beach during the second round of the U.S. Open after four spectators were injured by a runaway golf cart.

A report from the California Highway Patrol said a vendor parked a golf cart to deliver boxes near a concession stand and when they got out, a box fell onto the accelerator and the cart started to move.

The report said those injured ranged in age from 25 to 82 and that two people were taken to hospital.

Tournament organisers the USGA released a statement acknowledging the incident.

"Unfortunately, during today's second round of the U.S. Open there was an incident involving a golf cart on the 16th hole that resulted in three spectators and a vendor being injured and requiring medical treatment," the USGA said in a tweet. 

"We will continue to monitor their conditions."