[Updated at 9:16 a.m. ET] Four people are trapped in a coal mine in Swansea Valley, South Wales, police confirmed Thursday.
Rescue services are at the scene at Gleision Colliery, a police spokeswoman said.
Seven people were in the mine when the incident occurred, and emergency services were called soon after 9 a.m. local time (4 a.m. ET), the spokeswoman said.
Three of them got out of the mine and one has been taken to the hospital, she said, but his or her condition is unknown.
Local lawmaker Gwenda Thomas, who represents the Neath constituency in which the mine lies, near Cilybebyll, issued a statement saying she was heading back to the area.
"I am currently travelling back to Rhos community center from Cardiff. My thoughts are with all the family and friends of those currently trapped in the mine and I have confidence in all the emergency services at the scene."
A spokesman for Thomas, Robert James, told CNN the colliery was one of the few remaining drift mines operating in the area.
In a drift mine, coal is excavated from the side of a hill using shafts that are almost horizontal.
- CNN's Laura Smith-Spark contributed to this report.