A group of tourists got dangerously close to a bear in Yellowstone National Park, taking photos as the bear snacked on a patch of grass just a few feet away, a video from late May shows.

About 10 minutes passed before a momma black bear with two cubs appeared on the roadside in front of me. I was too close and momma bear shot me a warning glance.

In this Sept. 25, 2013, file photo, a grizzly bear cub eats apples in a tree a few miles from the north entrance to Yellowstone National Park in Gardiner, Mont. Alan Rogers/The Casper Star-Tribune ...