As many as 10,000 people were watching as the Simi Valley fireworks display unloaded into the audience on Thursday, injuring 28. Police suspect the platform holding the fireworks collapsed, causing them to fire downward, into the crowd.
"There was a big boom. Everybody started running down the street. People were screaming,” Justice Allen, 17, told the Los Angeles Times. "Everybody was just terrified. People hid in bushes."
A bomb squad was assigned to removing the unexploded fireworks Thursday night.