Firefighters were called just before 8pm to the blaze in Portswood Road, Southampton.
15 fire engines from across Hampshire are at the scene.
About 75 firefighters rushed to the scene.
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Hampshire Fire and Rescue Service will bring in relief teams and crews will tackle the fire for a few hours.
The road will be closed until morning.
The cause of the fire is currently unknown.
A fire brigade is in the area and a police drone is being used.
No injuries have been reported.
@dailyecho @itvmeridian Portswood Road pic.twitter.com/FpmCrWzm3j
— William (@WillCSwain) July 8, 2022
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