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A rolled over semi blocked all lanes of northbound Interstate 405 in downtown Bellevue at the start of the morning commute.

The crash happened around 5 a.m. near the NE 4th Street / NE 8th Street interchange.

WSDOT and state troopers were doing traffic control and intermittently opening lanes to relieve the backup, which had reached nine miles by 8:00 a.m.

The semi spilled an estimated 50-80 gallons of fuel from its own tanks that needed to be cleaned up.

The Department of Ecology said upwards of 70 gallons of fuel spilled into a nearby creek. Ecology staff planned to assist the Bellevue Storm Water staff to assess the problem.

There were no reports of injuries.