A wood platform holding live fireworks tipped over, sending the pyrotechnics straight into a crowd at the annual 4th of July show in Simi Valley, Calif.
Between 8,000 and 10,000 revelers were settling into their seats in the L.A. suburb for a fireworks display that never quite made it into the sky.
Instead, a bright plume of red and white bursts spread across the ground, injuring 28 people and sending others fleeing for safety. Take a look:
Police were investigating what led to the explosion, but said early indications show a platform designed and built to hold the fireworks gave way.
"For unknown reasons the structure that holds these ordinances collapsed," Stephanie Shannon of the Simi Valley Police said of the Fourth of July accident.