Published: Nov 11, 2010 1:22 AM EST
Updated: Nov 10, 2010 10:22 PM EST

LEHIGH ACRES, Fla. -  Deputies say Monday night a Ford Mustang crossed over in oncoming traffic and collided with a pickup truck on East 6th Avenue. The occupants of the truck, Jennifer Post and Barry Williams, died on scene. Those in the Mustang, Lisbon Ramirez and Elizabeth Soto were taken to the hospital in serious condition.

Neighbors who heard the crash rushed outside their homes. Some of them even fought the fire and eventually put it out.

Several say they heard a third vehicle speed away from the scene. They believe the Mustang and that third unidentified vehicle may have been racing.

Deputies are now looking for that third vehicle.