Mammoth Hot Springs, Wyoming - A grizzly bear attacked and seriously injured a hiker on Friday morning in Yellowstone National Park .

According to park officials, the man was hiking alone on a trail near Mammoth Hot Springs, the main and administrative site of the national park.

Suddenly, two bears appeared, which he believed to be grizzly bears.

According to Montana Public Radio, one of the animals attacked the tourist and severely injured his leg. Park spokesperson Linda Veress confirmed the injury and said the man was still able to escape on his own.

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He was later taken to a hospital.

She said that following the latest incident, the Beaver Ponds Trail, which loops between Wyoming and Montana is closed until further notice.

Most recently on May 10, a similar incident occurred after a park visitor got too close to a female grizzly bear and her cubs.

The mother grizzly charged, but then suddenly turned away, leaving the unidentified woman unharmed.

Meanwhile, park visitors are asked to stay at least a hundred yards away from all bears and wolves, and at least 25 yards away from other wildlife.

"It's very important to give these animals space," Veress said. When visiting national parks, always remember to stay alert, carry bear spray, make plenty of noise should you encounter a bear, and hike in groups of three people or more.