Lake Worth, Fla. -

A fire at an equestrian barn has killed several prized polo horses.

Firefighters say the fire began Saturday afternoon at the Gulfstream Polo Club Barn in Lake Worth.

It's been confirmed that seven horses were killed and four were injured in the fire.

The four injured were outside the barn as it burned.

The fire damaged 10 stalls.

Investigators say the fire was caused by an electrical overload inside a room that was being used as a kitchen.

Firefighters are now keeping an eye out for hotspots.