Leroy Township, PA (WBNG Binghamton) Crews in Bradford County have been cleaning up after thousands of gallons of chemicals are spilled Wednesday afternoon.

It happened at the Chief Oil and Gas Yoder well pad in Leroy Township, where 4,700 gallons of hydrochloric acid was spilled along the intersection of Crowfoot Road and South Road.

The Pennsylvania Department of Environmental Protection Emergency Response Team responded to the scene.

Some acid flowed into a small tributary that runs into Towanda Creek, killing some fish in the tributary. But dams were built before any acid could make in into the creek.

Contaminated soil along the roads is also being removed.

There were no evacuations, but a secondary road was closed because of the vapors.

Crews were at the scene earlier Thursday, collecting soil and water samples.

The cause of the spill is still under investigation, but it is believed to have been caused by a disconnected valve on the tractor trailer’s acid tanker, which DEP officias said provides the chemical for the hydrofracking process.