BOSTON (WHDH) - Boston fire crews are investigating the source of a hazardous materials leak that is flowing into the Neponset River.

A level two response was dispatched Tuesday afternoon to a water outfall near 90 River St. in Mattapan, where an unknown petroleum product was found to be leaking into the stream.

Crews are working to contain the leak.

The Massachusetts Department of Environmental protection is also on the scene.

No additional information was immediately available.

This is a developing news story; stay with 7NEWS for updates online and on-air.

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