Nevada County Sheriff Shannan Moon updates media on avalanche rescue efforts in Nevada City, Calif., on Wednesday. (AP Photo/Tran Nguyen)

NEVADA CITY, Calif. (AP) — Crews found the bodies of eight backcountry skiers near California’s Lake Tahoe and were searching for one more after they were caught in an avalanche, the nation’s deadliest in nearly half a century, authorities said Wednesday.

Authorities said the skiers had little time to react.

“Someone saw the avalanche, yelled ‘Avalanche!’ and it overtook them rather quickly,” said Capt. Russell “Rusty” Greene, of the Nevada County sheriff’s office.

Six from the guided tour were rescued six hours after the avalanche hit Tuesday morning during a three-day trek in Northern California’s Sierra Nevada, as a monster winter storm pummeled the West Coast.

Nevada County Sheriff Shannan Moon said investigators would look into the decision to proceed with the trip on Sunday despite the forecast for a major storm. That morning at 6:49 a.m., the Sierra Avalanche Center issued an avalanche watch, indicating that large avalanches were likely in the next 24 to 48 hours.

The center increased the watch to a warning hours before the avalanche hit. It’s not known if the guides would have known about the warning before they ventured out.

Authorities have told the families the mission has moved from rescuing people to recovering bodies, Moon said during a news conference.

The victims, including three guides, were found fairly close together, Greene said. The dead and missing include seven women and two men, ranging in ages from 30 to 55. The crews have not yet been able to remove the victims from the mountain because of the extreme conditions, the sheriff said.

Three to 6 feet of snow has fallen since Sunday. The area was also hit by subfreezing temperatures and gale force winds. The Sierra Avalanche Center said the threat of more avalanches remained Wednesday and left the snowpack unstable and unpredictable in an area known for its steep, craggy cliffs.

Rescuers were guided by beacons and a cellphone in dangerous conditions

Rescuers reached the survivors just before sunset on Tuesday.

The skiers all had beacons that can send signals to rescuers and at least one of the guides was able to send texts, but it wasn’t clear if they were wearing avalanche bags, which are inflatable devices that can keep skiers near the surface, Greene said.

While they waited to be rescued, the survivors used equipment to shelter themselves and fend off temperatures dipping below freezing. The survivors located three others who had died during the wait, Moon said.

Rescuers used a snowcat to get within 2 miles of the survivors, then skied in carefully so they didn’t set off another avalanche, the sheriff said.

One of those rescued remains in a hospital Wednesday, Moon said. A guide was among the survivors.

The area near Donner Summit is one of the snowiest places in the Western Hemisphere and until just a few years ago was closed to the public. It sees an average of nearly 35 feet of snow a year, according to the Truckee Donner Land Trust, which owns a cluster of huts where the group was staying near Frog Lake.

The avalanche is the deadliest in the U.S. since 1981, when 11 climbers were killed on Mount Rainier in Washington state. Each winter, 25 to 30 people die in avalanches in the U.S., according to the National Avalanche Center.