SeaTac brush fire blocks lanes of northbound I-5

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SEATAC, Wash. - An overnight brush fire backed up traffic on northbound Interstate 5 in SeaTac for miles during the morning commute.

Late Sunday night, fire crews were called to I-5 near South 188th Street for a large brush fire along the highway.

The fire grew quickly, spreading north and south and up the bank into small trees. About 3 acres were burned.

Fire crews from SeaTac, Federal Way, Tukwila, Port of Seattle, Kent and Boeing responded with about 40 firefighters and 13 fire trucks fighting the flames.

The fire was mostly contained in under an hour, but crews remained at the scene well into the morning commute Monday to ensure all hot spots were put out.

One right lane of northbound I-5 remains blocked at 10:40 a.m.  At one point, the backup was as long as 8 miles.

The cause of the fire is under investigation.

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