A 17-year-old boy was attacked in Barrow late on Friday night.
The incident happened at around 11.30pm in an alleyway off Greengate Street.
The boy suffered injuries to his head and stomach in the assault.
Police are searching for two suspects and say both were wearing balaclavas and dressed in black.
Cumbria police are appealing for witnesses and anyone with information is urged to call 101.
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