A huge blaze was seen to have ripped through an industrial building on Friday evening in Bootle.
A number of roads were closed as police and fire crews tackled the incident.
At around 9.10pm on February 25, fire crews rushed to an industrial building on St John's Road.
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Once five fire engines arrived at the scene just minutes later, they found a builders yard well alight and a section of St John's Road and Syren Street were cordoned off.
In an update on Sunday morning, Merseyside Fire and Rescue Service confirmed that two gas cylinders had been identified as being involved in the fire.
Crews "utilised the available water supply to cool the cylinders, monitoring and recording temperatures every 15 minutes".
A spokesman added: "The aerial appliance and water supply was no longer required and left the incident, as firefighters fed water to the incident ground from the hydrant supply through the monitoring stage.
"Temperatures continued to decrease over the next two hours and following further inspection in line with MFRS protocols, was deemed cool enough to hand over to the site owner.
"Once the external handover was completed, our crews left the scene shortly before 1am this morning."
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