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Probe Underway Into Fatal Simi Valley Garage Explosion Suspected to Involve Fireworks

The Simi Valley Police Department has closed off Edmund Street to allow fire and police investigators to determine what triggered Thursday’s fatal blast.

Traffic on Interstate 80 in San Pablo, California, US, on Thursday, July 3, 2025. About 61.6 million Americans will drive this Independence Day holiday, up 2.2% over last year, according to AAA. Photographer: David Paul Morris/Bloomberg via Getty Images
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Overview

  • The explosion ripped through a garage on the 1600 block of Edmund Street late Thursday morning, sending flames into the adjacent two-story home.
  • Emergency crews found one person killed inside the garage and extinguished fires that spread to the house and a nearby pickup truck.
  • Ventura County firefighters have said fireworks stored in the garage are the leading theory, though officials have not confirmed the exact cause.
  • NewsChopper4 video and neighbor accounts show a blown-off garage door, a collapsed roof section and thick black smoke visible for miles.
  • Authorities have warned residents to keep clear of the scene as investigators sift through debris for evidence.