04/08/2012 07:48 EDT | Updated 06/08/2012 05:12 EDT

Alberta girl, 3, dies after fall into icy water: reports

One of two young sisters found submerged in a icy pond in central Alberta has died, according to media reports.

The girls, aged 5 and 3, were discovered unconscious in a slough, or small body of water, by family members who called RCMP around 10:20 a.m. MT Friday.

The girls were first taken to hospital in Red Deer and then flown by STARS air ambulance to the Stollery Children's Hospital in Edmonton where they were listed in critical condition on Friday.

Since that time, numerous media reports have said the 3-year-old has died.

RCMP, staff at Stollery Children's Hospital and Alberta Health Services have declined to comment on the reports.

Out of respect for the family's wishes, RCMP are not providing further updates.

A source told the Calgary Herald the young girl’s family plans to release a statement but that they aren’t “strong enough to do that” yet.

The sisters were found in 1.5-metre-deep water after slipping through the ice.

Alberta officials said they don't know how long two young girls were submerged before they were found on their family's rural property southwest of Red Deer, Alta.

RCMP are investigating but said nothing indicates this was anything beyond a tragic accident.