Pierce County sheriff's deputies say that the boy had injuries so severe they suggest torture, the Tacoma News-Tribune reported.

"We want to know how this kid received these injuries," Sgt. Ed Troyer, a spokesman for the sheriff's office, said. "There are some significant torture and abuse signs -- multiple -- on the kid."

The woman who brought the boy in said that another woman she did not know came to her house Sunday with the boy and a diaper bag of clothes and other items and left him, the Seattle Times said. The woman said she would kill the boy if she had to keep him.

Investigators say that the woman who came to the hospital has varied her story somewhat and they are unsure if she is telling the truth. But they do not believe she is the boy's mother, and she has not been charged.