The San Jose Fire Department said two homes were involved in a 2-alarm residential fire on Wednesday, fueled by "compromised gas meters."
The company that operates the site said the fire started while contractors were testing solar panels on the roof, providing a possible explanation for how the blaze began.
Hospitals across the Bay Area are closely monitoring supplies after a fire tore through the Medline medical supply distribution facility in Tracy last Thursday, raising concerns about causing disruptions and delays.
A shelter-in-place order has been issued as firefighters battle a massive fire.
Cleanup efforts continue at the Medline warehouse site in Tracy after a massive fire last week destroyed the 1-million-square-foot facility, leaving widespread debris and damage throughout the area. Officials released a list of chemicals stored at the facility, warning that ash and debris may contain hazardous materials, including metals and other fine particles that could be harmful if inhaled or touched without proper precautions.