ALERT: Police ID driver killed; search for hit-and-run suspect

20 hospitalized in Fourth of July accident

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SIMI VALLEY, Calif. (CNN) - A fireworks display in Simi Valley, California, turned disastrous when fireworks exploded low to the ground and injured 28 people.

At least 20 were hospitalized, including four who were moderately or seriously injured, said Capt. Mike Lindbery of the Ventura County Fire Department.

Witness Annisa Wynn told CNN affiliate KTLA fireworks suddenly began shooting sideways into the crowd instead of up in the air,

"The fireworks were so close, you could see them on the ground," Wynn said. "It never happens this way. People were screaming."

Click below to view raw footage of the fireworks.