A man suffered cuts to his neck during a fight at a Berkshire nightclub during the early hours of Monday.
Thames Valley Police said the incident happened in the men's toilets at Liquid nightclub in William Street at about 0230 GMT.
The injured man - a 19-year-old - was involved in an argument and was assaulted with a "sharp object".
He was taken to Wexham Park Hospital where he is in a stable condition. His injuries are not life threatening.