Cumbria Police say a young man was victim to a "vigilante" attack in Kendal at the weekend.
The 19-year old answered the communal door at a block of flats at Liberty House on Highgate in the early hours of Saturday morning.
He was beaten up by a group of five males, who had two females with them.
A police spokesperson says the attackers appear to have taken the law into their own hands; but added it was an unprovoked assault.
The victim's undergone specialist treatment after his cheek and nose were broken.