A man in his 30s was attacked by a group of six men, one of whom was reportedly armed with a baseball bat, in the early hours of Saturday, police say.
The incident happened in the Newtownabbey area.
The man was taken to hospital with a head injury.
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A spokesperson for the PSNI said: "Detectives are appealing for information after a report that a man was assaulted in Newtownabbey in the early hours of Saturday, July 1."
Detective Sergeant McDowell said: “It was reported around 4.05am, that a short time earlier, a man was assaulted by six men in the Glenvarna Drive area. It was reported that one of these men was armed with a baseball bat.
“Officers attended, along with colleagues from the Northern Ireland Ambulance Service, and the victim, aged in his thirties, was taken to hospital for treatment to a head injury.
“Our enquiries are ongoing and we would appeal to anyone with information, including dashcam, CCTV or other footage, to contact us on 101 quoting reference 280 of 1/7/23.
"Alternatively, you can submit a report online using the non-emergency reporting form via http://www.psni.police.uk/makeareport/.
"You can also contact Crimestoppers anonymously on 0800 555 111 or online at http://crimestoppers-uk.org/ "
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