The event could be cancelled after multiple people sustained serious injuries.
A town in Spain decided to have a "cruel free" running of the bulls by replacing the animals with a large resin ball.
The ball looks like a gigantic volleyball and reportedly weighed 300 kilograms (equal to 661 pounds).
The event might be cancelled moving forward after two people sustained serious injuries, one of which suffered a serious head injury and is currently in a coma.
The video is tough to watch.
Here are some of the details of the event, from The Telegraph:
The mayor of Mataelpino, whose idea of substituting in the balls - painted with bull's faces - seven years ago has been emulated by other Spanish towns, has said the council will review its safety protocols before next year’s event.
The ball runs down more down 500 metres of sloping streets reaching a top speed of around 20 miles per hour.
But Mayor Javier Pérez de los Nietos also warned participants not to take the ball running lightly despite the absence of sharp horns and thundering hooves.
Our thoughts are with the victims and their families.