UPDATE AUG. 31 at 8:30 p.m.: The cause of a fireworks explosion that injured three people next to The Diamond Stadium in Lake Elsinore Friday is under investigation.
The explosion occurred at approximately 5 p.m. in a dirt lot near The Diamond Stadium at Campbell Street as a crew was setting up a fireworks display for Storm Baseball's regular "Friday Night Fireworks" show.
"An explosion in the product occurred. We don't know what the cause was, but [it] was a catastrophic explosion that consumed the vast majority of the product," explained Steven Beach, Battalion Chief, Cal Fire/Riverside County Fire Department.
Two employees from a fireworks display company and one inspector from Cal Fire/Riverside County Fire Department were setting up the show and were injured in the mishap, Beach said.
One of the fireworks company employees sustained first- and second-degree burns over 80 to 90 percent of his body, Beach said, and had to be airlifted from the scene to a nearby hospital.
The other employee and the firefighter sustained less severe burns and were both transported to area hospitals by ground ambulance.
The victims' names were not released.
As of 8 p.m. Friday, fire crews and the Riverside County Hazardous Device Team were on scene, disposing of remaining unexploded material.
Beach said crews were exercising extreme caution because investigators don't know what triggered the explosions.
Crews will be on scene throughout the investigation to determine what went wrong, Beach said.
Storm Baseball General Manager Chris Jones stated on the team's Facebook page this evening, "We regret to announce that tonight's fireworks show has been canceled due to an unfortunate accident involving setup of the fireworks show. Our thoughts and prayers are with the fireworks crew and all those involved. [The] game will still go on as scheduled at 7:05 p.m."
The explosions triggered a small vegetation blaze that burned less than a quarter acre and was quickly contained by fire crews. According to a Patch reporter on scene, a black Toyota truck -- which sustained extensive damage in the blaze -- and a Ryder truck were being used to set up the fireworks for tonight's game. --Daniel Lane contributed to this report