SOUTH WALES POLICE have urged people not to attend an “illegal gathering” at the Kenfig Industrial Estate in Margam.
Police did not specify the nature of the gathering, although several social media posts confirmed that an illegal rave was taking place at the site.
Members of the public have been told to avoid the area and not attend on foot or in vehicles.
An officer at the scene said that there were vehicles from people attending the party from as far away as Pembrokeshire and Bristol, if not further afield.
Road closures have been put in place and a police order to direct persons to leave the area is in force.
South Wales Police said on Twitter at 3.43am on Easter Sunday morning: “Police are aware of an illegal gathering at Kenfig Industrial Estate Margam.
“There is an order in place to direct persons to leave the area.
“For public safety reasons, please do not attend on foot or in vehicles. There are current road closures in place.”
The Welsh Ambulance Service said it responded to calls from the scene and took three people to hospital.
“None of those persons are seriously injured,” it said.
Assistant Chief Constable Mark Travis said initial reports suggested 1,000 people and 70 vehicles were at the scene.
“A number of officers have been deployed. We are urging people to leave the site safely and stay away from the event,” he said.
A large police presence remained at the scene on Sunday morning.
There are usually illegal parties in Wales over the Easter Bank Holiday Weekend. Most pass without incident.
