Canadian wildlife officials say four grizzly bears captured in western Canada were responsible for killing a mother and her adult daughter earlier this month in what investigators believe was a rare predatory attack. A British Columbia Conservation Office says DNA tests conclusively linked a female grizzly and her three yearling cubs to the deaths of Jenny Balcarras, 48, and her 20-year-old daughter Selah Reed. British Columbia Conservation Officer Service Jeff Tyre says the bears were not involved in a separate grizzly attack last November on a group of about 20 elementary school students and teachers in the same area.