Police in Fratton were called by colleagues from South Central Ambulance Service shortly after 7:45pm on Tuesday 3 March after a 43-year-old man had been assaulted on Somers Road North at around 6:25pm.
He was subsequently taken to Southampton General Hospital to be treated for a head injury, and remains in a serious, but stable, condition.
Two men, aged 34 and 54, have both been arrested on suspicion of causing grievous bodily harm with intent. The 54-year-old man has been bailed until 3 June pending further enquiries. The 34-year-old man has been released without charge and will face no further action.
Police say initial enquiries suggest a number of potential witnesses were in the area at the time.
Anyone who believes that they may have seen what happened should call 101 quoting 44260104836 or submit information via our website: https://www.hampshire.police.uk/tua/tell-us-about/cor/tell-us-about-existing-case-report/
Alternatively, you can contact the independent charity Crimestoppers 100% anonymously on 0800 555 111, or via their anonymous online form at https://crimestoppers-uk.org
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