Yellowstone bear runs at woman approaching with her phone. Now, park rangers are looking for her.

After video surfaced showing a woman walking toward a grizzly bear at Yellowstone National Park who then charged her, the National Park Service launched an investigation.

The woman appeared to disregard the park rule to stay at least 100 yards from bears at all times.

In footage captured by tourist Darcie Addington, who filmed the scene from her car on May 10, the woman walked up to the bear with the intention of taking a photo despite some warning her that she was too close. The grizzly then charged at her, and she calmly walked away after the incident.

"It was terrifying," Addington told USA TODAY.

Park rangers are still looking for the woman, who is described as white, in her mid-30’s, brown hair, and wearing black clothing during the time of the incident.

The park reports there is an average of one bear attack at Yellowstone each year. The most gruesome attacks at the park occurred in 2011 and 2015, where three people were killed by bears.

To avoid these attacks, the park has set some guidelines for tourists when visiting, which include never feeding the bears, maintaining a distance of 100 yards from a bear or wolf and driving away if a bear approaches a vehicle.

The park also recommends using a spotting scope to see animals from afar.

This article originally appeared on USA TODAY: Bear at Yellowstone park runs at woman with phone, NPS investigating