Caves and other mountain hideouts searched for fugitive known as 'Devil in the Ozarks'

There are plenty of hideouts in the rugged terrain of the Ozark Mountains, from abandoned cabins to campsites in the vast forests where searchers are hunting for a convicted former police chief known as the "Devil in the Ozarks."

Others are not only off the grid but beneath it, in the hundreds of caves that lead to vast subterranean spaces.

Local, state and federal law enforcement are continuing to scour the region around the prison. The FBI on announced Thursday it was offering a reward of up to $10,000 for information leading to his arrest.

"Until we have credible evidence that he is not in the area, we assume that he's probably still in the area," said Rand Champion, a spokesman for the Arkansas Department of Corrections.

Fugitive Grant Hardin, 56, "knows where the caves are," said Darla Nix, a cafe owner in Pea Ridge, Arkansas, whose sons grew up around him. Nix, who describes Hardin as a survivor, remembers him as a "very, very smart" and mostly quiet person.

For the searchers, "caves have definitely been a source of concern and a point of emphasis," said Champion.

"That's one of the challenges of this area — there are a lot of places to hide and take shelter, a lot of abandoned sheds, and there are a lot of caves in this area, so that's been a priority for the search team," Champion said.

The area around the prison is "one of the most cave-dense regions of the state," said Matt Covington, a University of Arkansas geology professor who studies caves.

Hardin, the former police chief in the small town of Gateway near the Arkansas-Missouri border, was serving lengthy sentences for murder and rape. He was the subject of the TV documentary "Devil in the Ozarks."

He escaped Sunday from the North Central Unit — a medium-security prison also known as the Calico Rock prison — by wearing an outfit designed to look like a law enforcement uniform, according to Champion. A prison officer opened a secure gate, allowing him to leave the facility. Champion said that someone should have checked Hardin's identity before he was allowed to leave the facility, describing the lack of verification as a "lapse" that is being investigated.

It took authorities about 30 minutes to notice Hardin had escaped.

Champion said that inmates are evaluated and given a classification when they first enter the prison system to determine where they are housed. There are portions of the Calico Rock facility that are maximum-security.

While incarcerated, Hardin did not have any major disciplinary issues, Champion said.

Authorities have been using canines, drones and helicopters to search for Hardin in the rugged northern Arkansas terrain, Champion said. The sheriffs of several counties across the Arkansas Ozarks had urged residents to lock their homes and vehicles and call 911 if they notice anything suspicious.

In some ways, the terrain is similar to the site of one of the most notorious manhunts in U.S. history.

Bomber Eric Rudolph, described by authorities as a skilled outdoorsman, evaded law officers for years in the Appalachian Mountains of western North Carolina. It was a five-year manhunt that finally ended in 2003 with his capture.

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Rudolph knew of many cabins in the area owned by out-of-town people, and he also knew of caves in the area, former FBI executive Chris Swecker, who led the agency's Charlotte, North Carolina, office at the time, said in the FBI's historical account of the case.

"He was anticipating a great conflict and he had clearly lined up caves and campsites where he could go," Swecker said.

Rudolph pleaded guilty to federal charges associated with four bombings in Georgia and Alabama.

There are nearly 2,000 documented caves in northern Arkansas, state officials say. Many of them have entrances only a few feet wide that are not obvious to passersby, said Michael Ray Taylor, who has written multiple books on caves, including "Hidden Nature: Wild Southern Caves."

The key is finding the entrance, Taylor said.

"The entrance may look like a rabbit hole, but if you wriggle through it, suddenly you find enormous passageways," he said.

It would be quite possible to hide out underground for an extended period, but "you have to go out for food, and you're more likely to be discovered," he said.

Hardin had a checkered and brief law enforcement career. He worked at the Fayetteville Police Department from August 1990 to May 1991, but was let go because he didn't meet the standards of his training period, a department spokesman said.

Hardin worked about six months at the Huntsville Police Department before resigning, but records do not give a reason for his resignation, according to Police Chief Todd Thomas, who joined the department after Hardin worked there.

Hardin later worked at the Eureka Springs Police Department from 1993 to 1996. Former Chief Earl Hyatt said Hardin resigned because Hyatt was going to fire him over incidents that included the use of excessive force.

"He did not need to be a police officer at all," Hyatt told television station KNWA.

He continued to have trouble in his brief stint as an officer in Gateway, according to the 450-person town's mayor Cheryl Tillman.

While Hardin was the town's sole officer, "there was things that I seen that wasn't good. He was always angry," said Tillman, who wasn't mayor at the time.

Hardin pleaded guilty in 2017 to first-degree murder for the killing of James Appleton, 59. Appleton, who was Tillman's brother, worked for the Gateway water department when he was shot in the head on Feb. 23, 2017, near Garfield. Police found Appleton's body inside a car. Hardin was sentenced to 30 years in prison.

He was also serving 50 years for the 1997 rape of an elementary school teacher in Rogers, north of Fayetteville.

He had been held in the Calico Rock prison since 2017.

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