Around 30 firefighters have been fighting a large fire in a warehouse, close to potentially explosive gas canisters.
A 200m cordon was erected when officers found the acetylene cylinders in a nearby property but it has since been removed as the fire was brought under control.
Crews were called to the blaze in Clark Street, Paisley, at around 3.30am on Friday and found flames breaking through the roof of the property, Strathclyde Fire and Rescue said.
Officers were told that a person may have been inside another building that was in danger of being caught up in the fire. Firefighters checked and found no one inside but discovered the acetylene cylinders which can explode when heated.
They left the building and erected the 200m cordon which closed roads and the main railway line serving Paisley Gilmour Street. As the fire was reduced the cordon was taken down and the rail line reopened at around 5.20am.
Officers remain at the scene cooling the gas canisters and an investigation will begin into the cause of the fire.
Meanwhile, officers from Central Scotland remain at the scene of a large recycling plant fire at Kilbagie Mill, near Kincardine, that started at around 8am on Thursday.
No one was injured in the blaze but recyclable materials such as clothing, mattresses and waste paper that were inside the factory caused the fire to spread throughout the building.
It was brought under control when 17 crews tackled the flames but officers continue to cool the scene and ensure all pockets of fire have been extinguished.