An apparent oil spill that flowed into a Massachusetts river Thursday night is now contained.
The Hanover Emergency Communications Center received a 911 phone call just before 7:30 p.m. for an unknown type of spill in the Indian Head River on Broadway at the Hanover/Hanson Town Line.
When firefighters arrived, a large amount of "an unknown fluid with a visible sheen" was flowing down the river from the area of Factory Pond.
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Authorities requested additional crews as well as help from the Massachusetts Department of Environmental Protection (DEP).
While deploying booms to contain the leak in the river, a search of properties in the area found heating oil leaking from tanks in the basement of nearby Country Ski and Sport, Inc.
Crews were able to contain the leak to prevent it from further flowing into the river.
At that point, the DEP said just over 100 gallons of fuel leaked from the tanks and into the containment area.
After moving downstream just over a mile, crews found the oil had traveled past the containment area so another area was set up at Luddam's Ford to try and prevent the oil from reaching North River.
By about 11:30 p.m. the incident was cleared. The DEP plans to oversee further clean-up efforts.