The Snohomish County Sheriff's office says it was just after 10:30 when they got a call from 16-year-old Cynthia Contreras saying she and her young daughter Isavel were beaten.

Cynthia first called her mother, Esperanca Contreras, to tell her what happened. Esperanca then raced over to their South Everett apartment and helped them escape back to her house, where they called 911.

Esperanca was shocked the see the injuries to her young granddaughter. "Oh it was awful," she said. "I never thought a person would do that to a baby and it was his own daughter."

According to court documents, the father, Aaron Alvarez, began punching Isavel in the stomach, saying "that's weird, she can still breath when I punch her." When she still would not stop crying he then allegedly held her mouth under a running showerhead in the apartment bathroom.

Court documents then say he put duct tape on the baby's mouth, duct taped her legs and hands and taped her hands to her waist. He then allegedly started punching the baby, removed the tape from the infant's mouth, inserted a T-shirt and tried to tape her mouth again with the T-shirt in it.

Cynthia says she gave the baby CPR and ran with her to the apartment upstairs to call her mother.

"It breaks my heart because, how can he do that to a baby? To a defenseless baby? Tie her up like she was a animal?" said Esperanca Contreras.

When deputies arrived, they noticed the child had suffered serious injuries. The girl was taken to Providence Hospital's Colby Campus and later transferred to Harborview Medical Center in Seattle. She was listed in serious condition Monday with a lacerated liver.

The mother was also injured, but her injuries did not require immediate medical treatment.

Deputies then went to go look for the father, who had left the scene in his car. He was stopped a short distance away and arrested.

He has been booked into the Snohomish County Jail on for investigation of attempted murder and first-degree assault of a child.

Cynthia later told police that the baby's father also beat Isavel on Mother's Day with a cell phone charger cord.