Ambulance response time investigation completed in fatal Calgary dog attack

Alberta Health Services says a communications mix-up is the reason why it took an ambulance 30 minutes to respond after dogs attacked an 86-year-old woman in Calgary.

It says the call for help was initially triaged as non-life-threatening.

Police later told emergency medical services that the woman's injuries were serious and she died.

Police say the three dogs, which were seized by the city, are believed to be a North American pit bull-terrier mix, a North American Staffordshire mix and an American pit bull.