Fire crews continue to remain at the scene of a major blaze at a high voltage electrical substation near Heathrow Airport, following the large-scale fire that broke out late on March 20. The London Fire Brigade (LFB) has confirmed that the fire, which caused significant disruption and a power outage at Heathrow, is now being treated as non-suspicious.
The Metropolitan Police Service (MPS), initially leading the investigation due to the impact on critical national infrastructure, has now handed over responsibility to the London Fire Brigade, following confirmation that there is no indication of foul play.
Firefighters Still On Site Managing Hot Spots
While the blaze was brought under control after hours of intense firefighting, LFB crews remain on site to monitor and extinguish any lingering hot spots within the electrical distribution equipment.
The incident, which prompted more than 212 emergency calls, involved a transformer containing 25,000 litres of cooling oil, creating significant hazards due to the flammable nature of the oil and the presence of live high-voltage equipment.
Massive Emergency Response and Evacuations
At the height of the emergency, ten fire engines, two Bulk Foam Units, and one High Volume Pump were deployed — totalling around 70 firefighters. A 200-metre safety cordon was established, and 29 people were evacuated from nearby properties. A further 150 people were temporarily housed in a rest centre as a precaution.
London Fire Brigade Deputy Commissioner Jonathan Smith praised the swift and brave efforts of frontline responders:
“Our firefighters worked tirelessly in challenging and hazardous conditions overnight to bring the fire under control as swiftly as possible.
I would like to take this opportunity to thank firefighters and Control officers for their courage and professionalism in what were very challenging circumstances.”
Ongoing Fire Investigation and Safety Review
As the official cause is now being investigated by LFB Fire Investigation Officers, with assistance from scientific advisors, the focus will remain on the electrical distribution equipment. LFB has also confirmed that their Fire Safety Officers are continuing to assess the incident under the Regulatory Reform (Fire Safety) Order 2005 to determine any further safety concerns or breaches.
Deputy Commissioner Smith added:
“The Brigade will maintain a small presence on scene over the coming days to ensure any remaining hot-spots are fully extinguished.”
Impact on Heathrow Airport and Beyond
The blaze caused significant disruption at Heathrow Airport, with over 1,350 flights cancelled or delayed, leading to massive economic losses and widespread passenger frustration. The airport is still working to restore full operations, and the incident has sparked broader discussions around the resilience of critical infrastructure.
Further Updates Expected
Authorities have pledged to continue updating the public as investigations progress and safety measures are reviewed. In the meantime, passengers and local residents are advised to follow official updates from Heathrow Airport, LFB, and local authorities.
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