The death toll is now 30 in the devastating mudslide in Snohomish County, Washington.
Families of victims are being prepared for the chance that the remains of their loved ones may never be found.
Incident Commander Larry Nickey faces the task of telling those relatives that news.
"The range of emotions have gone from acceptance, quietness, to anger. And that is very typical in a situation like this," Nickey said.
He says right now, cadaver dogs are the best technology available for finding bodies buried in the mudslide. But he says they might never find all the bodies.
"We have prepared the victims' families that we may not find everybody. They understand, but we will continue our best to help them be reunited," he said.
He added that reinforcement dogs are coming in to replace the ones that have become exhausted searching the slide area near Oso.
He said that when a body is found, it's mapped in order to establish a flow pattern that could result in finding more victims.