SEATTLE — Washington officials are monitoring an oil spill at a refinery.

The Seattle Times reported crews scrambled to contain the spill that happened late Friday at the Shell Puget Sound Refinery in Anacortes.

It wasn’t clear Saturday how much spilled when a barge was transferring about 5 million gallons of crude oil from Alaska to the refinery. Washington state Department of Ecology spokesman Ty Keltner said it appears a much smaller quantity spilled.

Keltner said an inspector will be assessing why the spill occurred. Workers will be looking for any oiled wildlife.

The spill was at the end of a long pier extending into Fidalgo Bay.

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