8 people shot dead, 1 severely, at Elewis Ellis Park in Fort Pierce.

FORT PIERCE, Florida. Eight people were injured, including one in critical condition, in a shooting that occurred during an auto show in Elewis Ellis Park on Martin Luther King Jr. Day, the St. Lucie County Sheriff’s Office said Monday night.

Four more people were injured when they fled the scene in a park near Avenue M and 13th Street, the agency said in a Facebook post.

AND Show of cars and motorcycles “Streets on lock” was scheduled in the park from 14:00 to 17:00. The shooting happened after the end of the event.

“There was some kind of disagreement between the two sides, and unfortunately they decided to resolve it with guns,” Deputy Chief Executive Brian Hester told reporters.

Hester called the aftermath of the shooting “mass chaos.”

WATCH: Deputy Chief Describes ‘Mass Chaos’ After Park Shooting

St. Lucie County Deputy Chief Brian Hester describes “mass chaos” after the Fort Pierce Park shooting.

“People were hiding behind cars, hiding everything they could hide behind,” Hester said. “It was quite difficult to tell who was the victim and who was just hiding at that moment.”

Hester said MPs treated several people in the park while other visitors took them to a nearby hospital.

He said that there were no suspects, although the deputies were investigating several leads and information from witnesses.

The calendar says security is handled by the sheriff’s office.

The agency posted a warning on Facebook before 19:00.