Fireworks blast
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Crowd injured at firework display in California, USA

5 July 2013 Last updated at 10:57 BST

More than 20 people have been injured during a fireworks display in California to celebrate Independence Day.

Authorities said a wooden platform holding live fireworks tipped over, sending the pyrotechnics into the crowd at a park in Simi Valley.

Mobile phone footage filmed by a spectator showed fireworks exploding close to the ground, apparently out of control.

Four people were listed in serious condition, but their injuries were not believed to be life-threatening.