The death toll in Saturday's U.S. mudslide has risen to 14 on Tuesday with fears that the figure could rise as there are more than one hundred people unaccounted for, according to local officials.

Rescue operations are continuing with the support of volunteers, dogs and aircrafts where the depth of mud is up to 5 meters, according to Shari Ireton, sheriff's spokeswoman of Snohomish County, a rural area in 90 kms from the city of Seattle.

The authorities are blaming the heavy snowfall last month for the landslide. Four of the seven injured people are in critical condition.