A 44-year-old man found mysteriously injured in Oxford city centre remains in hospital with serious head injuries.
A passer-by discovered the man in St Aldates at around 10.25am on Sunday.
A bike was nearby but police do not know if he was attacked or was involved in an accident.
He remains at the John Radcliffe Hospital this morning in a serious condition and is still too unwell to be interviewed by police.
Anyone with information should call police on 08458 505505 or Crimestoppers on 0800 555111.
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