A 26-year-old man suffered severe head injuries in a violent hammer attack in the town centre.
Police said he was assaulted in Canal Walk, near the front of House of Fraser, at about 4pm yesterday (THUR).
It is believed he knew the three men and one woman involved, although it is thought only one man actually carried out the attack.
The victim was treated at the Great Western Hospital for his injuries. The assailant is described as wearing casual clothing.
Anyone with information should call Swindon police on 0845 408 7000.
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