Rescue workers were unable overnight to reach some 65 or more miners trapped after an underground explosion inside a coal mine in northern Mexico.
Authorities said there might have been as many as 80 miners inside the Pasta de Conchos mine when the explosion occurred early Sunday.
Rescue operations are going slowly because of the need to proceed with great care, owing to the risk of new explosions.
Relatives of the missing workers kept a vigil overnight at the entrance of the mine.
15 workers were rescued from the mine yesterday, many of whom suffered burns and other injuries.
The miners are understood to be trapped 2km underground, not far from the industrial city of Monterrey and 100km southwest of Eagle Pass, Texas.
