Federal agents have arrested one of two convicted murderers who escaped from a prison in Arizona, but are still looking for a second escapee and their accomplice.

Tracy Province was arrested in Wyoming, 60 miles away from Yellowstone National Park.

News of Province's arrest came jusut after over 100 agents and armed park rangers were deployed into the park.

The manhunt grew after the escapees were linked to two murders.

"They consider themselves as Bonnie and Clyde," said US Marshal Services spokesman David Gonzales. "This is very, very serious business."

John McCluskey escaped from prison with Province 10 days ago, and their suspected accomplice, Casslyn Welch, are thought to still be on the lam.

Officials are concerned that some campers in the park may be unaware of the search going on in the area around the famous Old Faithful geyser.

"They just don't have any regular access to any news because of the remote nature of the place," park spokesman Al Nash said.

He added, "The bottom line is, it's safe, everything's open and park visitors should not be unduly concerned."

About 30,000 visitors are expected to enter the park today, according to officials.

Before Province was arrested, the authorities thought the three were heading to Canada.