Overview

• On June 20 at Casa Grande High School, groundskeeper Juan Carlos Lopez inadvertently detonated an illegal firework while mowing the lawn
• The blast lifted Lopez’s gas-powered mower off the ground and left him with only minor injuries, police said
• The Sonoma County Sheriff’s bomb squad and Petaluma Fire Department secured the area and gathered evidence at the scene
• Investigators are reviewing surveillance footage to trace how the device arrived on school grounds
• Petaluma authorities have bolstered enforcement of the city’s total fireworks ban with increased patrols and public education campaigns