YREKA, Calif. (AP) — Officials say Interstate 5 in far Northern California is now open after a crash involving about 60 vehicles.

California Department of Forestry and Fire Protection spokeswoman Julie Hutchinson says a number of people suffered minor to moderate injuries in a series of crashes that started around 6:30 p.m. Tuesday and stretched for nearly a mile along the northbound side of the freeway.

Hutchinson says she doesn’t know the exact number of people injured. The southbound side of the interstate was closed overnight so emergency vehicles could reach the scene.

It’s not known what caused the pileup.. But Hutchinson says stretches of the roadway were icy. The National Weather Service has issued a winter weather advisory for the area.

The crashes took place near Yreka, just south of the Oregon border, or about 250 miles north of Sacramento.

Copyright 2012 The Associated Press.