Police say no one was injured and there have been no reports of any damage to property.
The incident happened at Devon Square around 1.15 am.
Antrim CID has appealed for anyone who was in the area at the time, and who may have heard or seen anything, to contact them.
Detectives can be contacted on the non-emergency number 101.
Or alternatively information can be passed anonymously through the freephone Crimestoppers number on 0800 555 111.