Two gangs of Asian men brandishing hammers and knives clashed on an Accrington street.
One group of seven fought with a group of three outside Tyson's Gym on Victoria Street on Monday evening.
Detectives said an 18-year-old man from Accrington suffered concussion and required seven stitches after his ear was knifed.
A 23-year-old was also injured after being punched in the brawl.
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