One lane of northbound Interstate 5 through Marysville is shut down after a brush fire on the shoulder.

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One lane of northbound Interstate 5 through Marysville is shut down after a brush fire on the shoulder.

Traffic is backed up eight miles because of the fire, according to the state Department of Transportation.

Washington State Patrol Trooper Mark Francis said it’s too early to tell if the fire is connected with a string of brush fires deliberately set a few weeks ago.

On June 30, 10 small blazes were set back to back during a more that two-hour period along I-5 between Everett and Arlington. The fires caused a nine-mile backup, according to the State Patrol.

Troopers are looking for two men, described as in their 50s, in a light-colored Hyundai Sonata. Investigators managed to pull a fingerprint off a flare believed to have been used to set the fires but no arrests have been made, said Francis.

Francis said investigators are still seeking tips on the June 30 fires and ask that anyone with information call the State Patrol at 360-654-1204.