Police were called by North West Ambulance Service at 2.15am who attended an anonymous report of a male staggering and bleeding on De Lacy Street in Ashton-on-Ribble.
A 42-year-old man was found with injuries to his leg, but these injuries are not life-threatening.
Anyone with information should call police on 101 quoting log 0099 of December 1 or Crimestoppers on 0800 555 111.
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