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Thames Valley Police is releasing CCTV images of a man it would like to speak to in connection with an attempted murder in High Wycombe.
Officers were called to the Hilltop Community Centre in Crest Road, Booker, at about 3.50am on 7 April to reports that a fight had broken out.
Two men were taken to the Stoke Mandeville Hospital, one with minor injuries and the other with serious, but not life-threatening, injuries.
Investigating officer Det Con Kim Twaite said: "We would like to speak to this man as a witness as we are aware he was there on the night of 6 April and may have seen something.
"We urge him to come forward and help us with our enquiries."
Allinjah Williams, aged 24, of Tidworth, Hampshire was previously charged with attempted murder and grievous bodily harm with intent. He is due to appear at Reading Crown Court today (1/7).
Anyone with information can contact Det Con Twaite on 101.