SEATTLE - Collisions involving multiple vehicles on Wednesday afternoon prompted the closure of all lanes both directions of Interstate 90 across Snoqualmie Pass.

The accidents started at Denny Creek Bridge as one car after another started to slide into each other downhill.

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Dozens of vehicles of all sizes collided in the snow near Exit 47.

According to WSP Troooper Jeff Merrill, up to 50 cars and 10 semis were the pileup, but of those, 25 cars and 6 semis were actually involved in the accident; the rest did not hit other vehicles.

There were seven reported injuries, none of them was life-threatening.

It was snowing heavily when the accidents occurred about 3:30 this afternoon, and medic units had to thread their way through the jumbled vehicles to the injured.

Some of the collisions involved tractor-trailer rigs, said Merrill.

The eastbound lanes of I-90 were closed near North Bend, about 35 miles east of Seattle, because of a number of big rig spinouts near the Snoqualmie Pass summit. The westbound lanes were closed near Cle Elum, on the east slopes of the Cascade Mountains, the state Department of Transportation said.