Fireworks explosion in Simi Valley, Calif., injuries reported [photos, video]; Update: Premature detonation to blame?

Scary news tonight out of southern California as Independence Day wrapped up: A fireworks mishap in Simi Valley led to all the explosives going off at once. There are several reported injuries. Twitter users on scene broke the news on social media tonight.

Video:

Vine:

Twitchy will continue to monitor and update as news developments. Prayers out to all involved.

Update: KTLA reports 10 injured, per fire officials.

The NBC news affilate in Los Angeles reports 20 injured.

This Twitter user says it’s a Level 3 incident, according to scanner traffic:

Update:

An eyewitness said the fireworks exploded on the ground and towards the crowd:

More:

More video:

The latest injury numbers:

Update:

Authorities believe the explosion was caused by the premature detonation of “at least one pyrotechnic device.”

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