The search is on for a man who allegedly assaulted a volunteer at a rugby league tournament in the Northern Rivers region.
Officers have been told the 57-year-old volunteer was knocked out after he was punched in face by an unknown man at Kingsford Smith Park in Ballina at 4.30pm on Sunday.
The victim was assessed by NSW Ambulance paramedics before being taken to Ballina Hospital.
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He was transferred to Lismore Base Hospital, where he underwent and CT scans and was admitted as a precaution.
Police have launched an investigation into the incident and would like to speak to a man who might be able to assist with inquiries.
He is described as being of Caucasian appearance, with a thick brown beard and aged in his 30s. He was last seen wearing a t-shirt, with denim jeans with a large belt buckle.
Anyone who witnessed the incident or has information is urged to contact police.