Five fire engines were called to a blaze in a second-floor flat in Wisbech on Tuesday afternoon.
The fire, believed to have been caused by sunlight reflecting on to combustible materials, led to Churchill Road being closed from Weasenham Lane into Wisbech town centre for around two hours.
A Cambridgeshire Fire & Rescue spokesman said: “Crews from March, Long Sutton and West Walton were called to a flat fire in Orange Grove, Wisbech.
“A fire had broken out in the roof space of a second floor flat.
“Four firefighters wearing breathing apparatus used two hose reels and a jet to extinguish the fire.
“Firefighters cut away at the roof and dampened down the area. The fire was fully extinguished by 2.55pm.
“The residents of the property were out safely on the arrival of the fire service.
“A fire investigation has been carried out and the most likely cause was accidental, believed to be sunlight reflected on to combustible materials.”
Station Commander Mick Jackman said: “The first crews in attendance worked very hard and did an excellent job to cut away the roof material, extinguish the fire and prevent it from spreading.”
A police spokesman said: “We were called at about 2pm to Orange Grove, Wisbech by the fire service to reports of a building on fire.”
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