California has seen a spate of accidental fireworks explosions leading up to the Fourth of July with a Wednesday morning detonation killing 1 in a Simi Valley home and a similar incident critically injuring two people in a Bay Area residence.

One person is dead after a house fire in Simi Valley, which authorities determined to be caused by explosions from fireworks on Thursday afternoon. The Ventura County Fire Department said they received calls around 11:48 a.

Three homes in Pacoima caught on fire Thursday night. The Los Angeles Fire Department said it started at roughly 9 p.m. in the 12900 block of Corcoran Street. Firefighters said fireworks were active at the scene. LAFD entered defensive mode and started fighting fire from a safe distance "to prioritize life safety," the department said.

More than 130 firefighters battled a fire involving fireworks explosions that engulfed four homes in Pacoima and critically injured a woman on Thursday night, authorities said.