Grizzly bear kills couple and dog in Canada's Banff National Park; woman injured in separate bear attack in Montana

A grizzly bear killed a couple and their dog in Canada's Banff National Park before being euthanized.
The bear attack was reported via a GPS alert device; weather delayed the response team's arrival.
The incident follows a woman being injured in a separate bear attack in Montana near Glacier National Park.
Authorities remind people to take precautions like carrying bear spray and traveling in groups when in bear country.
Certain areas of Banff National Park have been closed in the aftermath of the fatal grizzly attack.