A massive explosion in Hayward, California, early Thursday morning left six people injured and caused extensive structural damage along East Lewelling Boulevard. According to local fire officials, the blast was triggered by a damaged underground gas line struck during a construction project. The explosion ignited a fast‑moving structure fire, sending thick smoke into the air and prompting a multi‑agency emergency response.
Emergency Response and First Details From Fire Officials
The Alameda County Fire Department confirmed that firefighters responded to the three‑alarm incident shortly after the explosion occurred. Eight engines and two ladder trucks were deployed to contain the rapidly spreading flames. Authorities reported that six individuals were transported to the hospital with injuries, though no fatalities have been confirmed.
Officials said the blast took place in an area where crews have been widening sidewalks and bike lanes, which required excavation near underground utility lines.
What Caused the Explosion? Early Findings From PG&E
Pacific Gas & Electric stated that a third-party construction team struck and damaged an underground gas line while digging around 7:30 a.m. PG&E crews arrived shortly afterward to isolate the break and stop the flow of gas. According to the utility, gas had been released at multiple locations due to the damage, and although the main flow was shut down approximately ten minutes before the explosion, residual gas pockets appear to have ignited.
The result was a powerful blast that tore through a large structure, followed by a fire that engulfed portions of the building and surrounding area.
Eyewitness Accounts Describe the Blast as “Like a War Scene”
Nearby residents reported feeling a violent shockwave. One homeowner, who shared Ring doorbell footage with local reporters, said the explosion shook their house so forcefully that items fell off the walls. The surveillance video shows a bright flash followed by debris and flames shooting upward from the impacted structure.
Residents described the moment as chaotic, with windows rattling and thick smoke instantly filling the air.
Road Closures, Power Outages, and Regional Impact
The explosion also caused power outages affecting homes and businesses near Interstate 238. The California Highway Patrol shut down the southbound offramp at East 14th Street and multiple surrounding roads to secure the area for first responders.
Drone images showed significant damage to at least one commercial structure and widespread smoke drifting over nearby residential neighborhoods. Authorities warned drivers to expect delays and encouraged residents to avoid the area until cleanup and safety inspections are complete.
Ongoing Investigation and Safety Concerns
As emergency teams continue assessing the damage, investigators are focusing on the construction activity that preceded the explosion. The incident highlights the risks associated with underground utility work and has renewed calls for stricter safety protocols and coordination between contractors and gas utilities.
County officials stated that updates will continue as crews stabilize the site and ensure no further gas leak hazards remain.