SEATTLE (AP) — Officials say a tug boat and barge collided causing a diesel fuel spill on the West Duwamish Waterway in Seattle.

U.S. Coast Guard officials said in a news release they and the Washington Ecology Department responded to the spill Tuesday morning and were overseeing cleanup efforts.

The incident caused a breach in the tug's hull, which damaged one of its diesel fuel tanks. The tank's capacity is 9,000 gallons but tug operators reported that it contained about 1,200 gallons at the time of the crash.

Officials say the tug has been moored and the spill contained with layers of containment boom used to contain the diesel fuel and absorbent pads.

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