City of Joburg identifies three possible causes of the blast

The City of Johannesburg says it has identified three possible causes of the blast that caused the collapse of the Lilian Ngoyi Street, formerly called Bree Street. At least one person died and 48 were injured, eight of whom are still in hospital following the blast.
The Johannesburg City Manager Floyd Brink speaks to the media on preliminary investigations into what may have led to the blast that caused the roadway to collapse.
Brink says.
These are, ignition of Methane Gas in underground stormwater systems due to sewerage ingress, the ignition of natural gas, mixed with air, in this case, oxygen in underground stormwater drainage systems or service ducts, and the third and last possibility, the ignition of gas from a gas pipe burst. At this stage the only potential cause appears to be warranted, accidental leakage of natural into the service duct reaching explosion concentration levels of 05-15% and was ignited by a source unknown at this stage.”
UPDATE ON THE INNER-CITY EXPLOSION
The City Manager, Mr Floyd Brink leads a technical media briefing on the preliminary findings of the investigations into the explosion in the Inner City of Johannesburg yesterday afternoon.
Watch Live: https://t.co/Orw2bCyE8A…
— City of Joburg (@CityofJoburgZA) July 20, 2023
Source: SABC
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