People living near the Tata Steel plant in south Wales have been asked to stay indoors after a fire broke out.
The blaze started at one of the Port Talbot site's processing lines around 20:00 BST and was attended by Mid and West Wales Fire Service, with staff safely evacuated, Tata Steel confirmed.
South Wales Police said emergency services remain at the scene in Port Talbot and were working to manage the incident.
Large plumes of smoke were visible from the site and can be seen across the surrounding area.
Kellie Evans, who was driving along the road near the fire, described the scene as "very apocalyptic".
She said she "couldn't see the flames because the sky was so black", adding that many drivers pulled over to look.
Residents have been advised to keep windows and doors closed, while motorists should avoid the area and use alternative routes where possible.
Tata Steel said the fire was not linked to the controlled demolition of an old gas holder on Wednesday evening.
The company thanked site staff and emergency services for their "prompt and professional action".
Traffic cameras showed that the M4 near Port Talbot remained open but was congested.
