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26 April 2019, 08:07 | Updated: 26 April 2019, 08:19
People reported their houses shook with the force of the blast at the Tata Steel site in Port Talbot in the early hours of Friday morning.
Several bright flashes could be seen in video said to be of the incident shared online.
Emergency services including paramedics and firefighters rushed to the complex after 999 calls began to stream in at around 3.35am.
The National Police Air Service's St Athan wing also confirmed a helicopter had been scrambled to the scene.
One local resident tweeted: "There was just a big explosion from port Talbot steelworks that just shook the house, hoping no one was hurt."
South Wales Police said two people had suffered minor injuries in the incident and urged locals to avoid the area.
Early indications suggested the explosion came from a train used to carry molten metal, the force said.
"Emergency services remain on scene but we have had confirmation that all members of staff are accounted for and there are only two casualties with minor injuries.
"Early indications are that the seat of the explosion was a train which carries molten metal into the works.
"The explosion caused some small fires which are all under control and damage to some buildings on the site.
"South West Fire and Rescue Service have informed us there is no need for concerns re hazardous effects from the smoke from the fire."
The force added that the M4 motorway remained open.
Tata Steel said its personnel were working with emergency services at the scene.
"We can confirm there are no serious injuries and all employees have been accounted for. All fires are now under control."