Armed officers are currently in the Glyncoch area following a serious assault at a property in Cefn Lane last night.
The officers have been deployed as a precautionary measure as enquiries into the incident continue.
Two men were injured during the incident, which occurred shortly before 6pm. One was taken to the University Hospital of Wales with serious injuries, which are not thought to be life-threatening. He remains at the hospital where he is currently being treated.
Police are asking anyone with information about the incident to get in touch.
Armed police have arrested four men on suspicion of possession of a firearm at Talbot Green.
South Wales Police responded to an incident at a car wash in Swansea at around 2:40pm on Tuesday after receiving reports of a group of men in a 4X4 had made threats with weapons.
Officers later pulled over a vehicle which matched the description at Talbot Green and the arrests were made.
South Wales Police have stressed it is not being treated as a terrorist incident.
Armed officers were called to a Spar in Rhyl after reports of a man with a firearm last night.
North Wales Police say they arrested a man at a nearby house and recovered an imitation firearm.