Police have released the names of the twin toddlers who tragically died after their father pulled their lifeless bodies out of their backyard pool.

The three-year-old girls - Valentina and Penelope Ruiz - died at the hospital in Phoenix, Arizona, on Thursday, officials said.

'Preliminary information suggests that this incident is consistent with an accidental drowning,' Phoenix Police said in a statement on Friday. 

'At this time, there is nothing that investigators have found that appears suspicious.'

Police on Friday identified the two toddlers who drowned in their family's backyard pool in Pheonix, Arizona. Valentina and Penalapi Ruiz, 3, were rushed to a hospital where they were pronounced dead

Fire department officials said the twin's father called 911

Phoenix Fire Captain Rob McDade said the twin's father was the one who called 911.

'You can imagine what that would look like, how taxing that would be. A tremendous tragic scene,' he said.

McDade added the toddlers were underwater for an 'undetermined amount of time' before help arrived about 3.30pm on Thursday.

First responders took less than three minutes to get to the home on 63rd Avenue and Lower Buckeye Road and found family members administering CPR to the twins.

Phoenix Fire Capt. Rob McDade said it was 'a tragic scene' as family members tried to perform CPR on the children as first responders arrived at the home

Phoenix Police said the tragic incident is consistent with an accidental drowning

The backyard pool did not have fencing around it

The girls were rushed to a nearby hospital where they were pronounced dead, officials said. 

Aerial shots of the three-bedroom home showed a kidney-shaped pool that did not have fencing around it. 

'You can imagine what that would look like, how taxing that would be,' McDade said to local CBS 5 News. 'A tremendous tragic scene.'