According to Sussex Police, officers were called to 'a report of a disturbance' inside The Jungle Club in Chatsworth Road, Worthing, in the early hours of Sunday, October 31.
"Officers are investigating a subsequent report of an assault," a police spokesperson said.
"We were later able to obtain a statement from the victim and have regularly kept him informed of the progress made in the case so far.
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"The investigation continues."
Anyone with information is asked to report it online, by calling 101 quoting the reference number 171 of 31/10/21.
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