The supervolcano lying beneath Yellowstone National Park is not about to erupt despite animals appearing to flee from the site, scientists have said.
Experts at Yellowstone were responding to reports that animals leaving the park potentially signalled an eruption.
A number of bloggers uploaded footage of bison running away from the park and voiced concerns of an imminent eruption.
Blogger Jay Lee wrote in a post on his site tatoott1009.com: "Whether I believe this, or whether I don't believe the story or not, I don't know. I can tell you this story I saw this morning about the buffaloes running the street ... whether or not it's because of any activity in Yellowstone or not, I don't know.
"But I'll tell you this, whatever the case may be, that their running away from Yellowstone is an alert of some sort."
However, park spokeswoman Amy Bartlett told Reuters this is not the case: "It was a spring-like day and they were frisky. Contrary to online reports, it's a natural occurrence and not the end of the world.
Officials at Yellowstone and government geologists said the supervolcano is not due to explode for an extremely long time.
"The chance of that happening in our lifetimes is exceedingly insignificant," said Peter Cervelli, a scientist with the Yellowstone Volcano Observatory.
The bloggers also pointed to a 4.8 magnitude earthquake that hit the northwest section of Yellowstone over the weekend, with some people raising concerns of its effect on the volcano.
Cervelli said the earthquake is not a sign of a forthcoming eruption it, or any of the other earthquakes that have hit the area over the last hundred years, suggest the volcano will blow anytime soon.