SPOKANE -- Snow and icy roads north of Spokane and Coeur D'Alene caused at least four, single-car rollover accidents Wednesday morning.

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As snow began falling harder later in the morning, the road conditions prompted local authorities to urge motorists to use caution throughout the rest of the morning.

The wintry weather also caused a crash involving tractor-trailer rigs in heavy snow, which forced the closure of Interstate 90 and U.S. Highway 97.

The state Transportation Department reported the westbound lanes of I-90 closed at 8:25 a.m. Wednesday at Milepost 106 at the west end of Ellensburg, and U.S. 97 was closed at 8 a.m. near Blewett Pass, between Ellensburg and Wenatchee.

Traffic was down to one lane on I-90 from Milepost 83 to Milepost 87 near Cle Elum, and the freeway was closed in both directions at Elk Heights, about 12 miles east of Cle Elum, because of the tractor-trailer rollover.

State Patrol dispatcher C.L. Clarke said the collisions began mounting after heavy snow had been falling for a couple of hours.

The heavy snow comes as cool, showery air remains over the Pacific Northwest.