Investigation underway after firework triggers emergency call-out in Blackpool
Crews from Blackpool and South Shore were called to a domestic property on Topping Street at 6.40pm on Sunday, January 7.
On arrival the hallway of the house of multiple occupancy was heavily smoke-logged, the fire service said.
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Hide AdA firework was discovered at the scene and officers used a hose reel and breathing apparatus to extinguish it.
A spokesperson for Lancashire Fire and Rescue Service said it is unclear at this stage whether the firework was "discharged inside the property" or had been transferred in.
An investigation is now underway to establish the specific details of the cause of the blaze and crews were on the scene for about two hours.
Seven people were led to safety and no injuries were recorded.
Bus routes had been diverted away from the location but normal service has now resumed.