A black bear chased, caught and mauled a bicycle rider on a mountain trail in Canada's oldest and most popular national park, and was shot and killed when it refused to leave the area, a warden said. The biker, Greg Flaaten, 41, a Web administrator for the town of Banff, was being treated for severe arm injuries at Foothills Hospital in Calgary following the attack, and reconstructive surgery in the biceps and triceps area was scheduled Monday. Authorities initially feared Flaaten might lose his arm, but that concern was eased when a key artery was found to be intact, maintaining...