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A small explosion that occurred Friday afternoon at an underground coal mine in Pennsylvania killed at least nine people and injured about two dozen others, according to the U of P. The explosion occurred about 1:30 p.m. local time, the UofP said in a statement.

“This is an extremely dangerous time for everyone in the community, including our first responders, who have been deployed to the scene,” U of T Public Safety Chair Robert-Jan Barthelsen said in the statement.

It was not immediately clear what caused the explosion.

U. of P President Michael Curry said he was “shocked and saddened” by the loss of life.

“It’s a devastating event and a devastating tragedy,” Curry said.

“Our thoughts are with those affected by this terrible tragedy.”

The Associated Press reported that the blast happened when a water pipe and a water heater were in contact with each other and that water had been leaking into the mine.

The blast also blew a nearby power transformer, causing it to explode.

U of PA said the cause of the explosion was not yet known.

The Associated News contributed to this report.