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Four men and a boy have been arrested on suspicion of attempted murder over an attack in a town centre which left a man with "suspected stab wounds" to his back, police have said.

Gloucestershire Constabulary said the 21-year-old man was attacked on High Street, Cheltenham, at about 23:00 BST on Sunday.

He was taken to Southmead Hospital in Bristol but has since been released.

It appeared the attackers and the man "knew each other", the force said.

A spokesman said two other men had been arrested on suspicion of causing grievous bodily harm in connection with the attack and a further two were being held on suspicion of possessing of an offensive weapon.