A black bear with three cubs chased a group of picture-taking tourists on a bridge in Yellowstone National Park this week.

A video of the encounter was posted on the Montana Fish, Wildlife & Parks YouTube page on Friday.

Shot by Montana Fish, Wildlife & Parks' Winston Greely, the video shows the bear bounding along the bridge with the cubs keeping up as the tourists try to keep a safe distance.

A man can be heard yelling "Go, go" while some people on the bridge kept taking photographs even as the bear veered in their direction.

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