The offenders are white youths aged around 16 or 17
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Two men and two women were attacked with a metal bar by up to six youths in Bradley Stoke, South Gloucestershire.
They were sitting in the park area off Paddock Close, on Friday evening when they were attacked by the gang.
Both men were taken to Bristol Royal Infirmary suffering from internal bruising. The two women also suffered less serious injuries.
One man remained in hospital on Monday. The offenders are described as a group of white men aged about 16 and 17.
Police would like to hear from anyone who was in the area at the time and may have seen anything suspicious.