Poundstretcher Blackwood: Crews tackle ‘large’ shop fire
South Wales Fire and Rescue say the blaze at the Poundstretcher store in High Street started at about 02:00 BST on Wednesday and took six hours to bring under control.
The road is closed and people are being urged to stay away from the area while those nearby should keep windows and doors shut.
The building has been declared unsafe.
Crews from Cardiff, Merthyr and Aberdare areas have been at the scene. Six engines and two hydraulic platforms have been used to tackle the flames as well as four other powerful water jets. At one point there was 14 appliances at the scene.
By 08:15 BST, the fire service said the blaze had been brought under control and the incident was being scaled down.
A number of fire crews including a hydraulic platform will remain damping down.