A tour bus crashed through a guardrail along an icy Oregon motorway and tumbled down a steep embankment, killing nine people and injuring more than 20 others, authorities have said.
The charter bus carrying about 40 people lost control on the snow and ice-covered lanes of Interstate 84, according to Oregon state police.
The bus came to rest at the bottom of a snowy slope. More than a dozen rescue workers descended the hill and used ropes to help retrieve people from the wreckage in freezing weather. The bus driver was among the survivors, but had not yet spoken to police because of the severity of the injuries he had suffered.
Lt Gregg Hastings said the bus crashed along the west end of the Blue Mountains, and west of an area called Deadman Pass. Stretches of motorway in the rural and agricultural area of east Oregon tend to be icy in winter months.
The bus slid down the hill and landed upright, with little or no debris visible around the crash site.
St Anthony Hospital in Pendleton treated 26 people from the accident, including some who were treated and then transported to other medical facilities, said hospital spokesman Larry Blanc.
In addition to the people who were transferred from St Anthony to La Grand and Hermiston, Oregon, and Walla Walla, Washington, Mr Hastings said. Others were taken directly to hospitals further away, including Boise, Idaho, and Portland, Oregon.
I-84 is a major east-west motorway through Oregon that follows the Columbia River Gorge.
Umatilla County emergency manager Jack Remillard said the bus was owned by Mi Joo travel in Vancouver and state police said the bus was en route from Las Vegas to Vancouver.
The bus crash was the second fatal accident in Oregon on Sunday morning. A 69-year-old man died in a rollover accident.