Immigration agents arrested two Mexican contractors helping to tackle a wildfire in Olympic National Forest in Washington, a supervisor who oversees the crews said Thursday.

It was one of the first times federal immigration agents have been known to enter a fire zone to carry out President Donald Trump 's mass deportation orders , veteran firefighters said.

Two work crews, totaling 44 people, were gathered at a staging site near Lake Cushman around 9 a.m. Wednesday when federal agents appeared, crew boss David Diaz said.

They were only about a mile from the Bear Gulch fire line and planned to spend the day chopping lumber, Diaz said.

The cause of the fire, which started July 6, is still under investigation. It has scorched nearly 9,000 acres and was 13% contained Thursday evening,

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