MANILA, Utah (AP) - Dogs and airplanes were used Tuesday to hunt for two convicted killers who escaped from a county jail, while SWAT teams checked houses and other buildings for the dangerous pair.

Daggett County Sheriff Rick Ellsworth said he corrected the security breach that allowed the men to climb a fence and escape Sunday, but he wouldn't divulge how they broke out from an interior courtyard.

"To reveal the details of the escape could adversely affect our investigative efforts and hinder the recapture," Ellsworth said in a statement.

Utah and Wyoming authorities were looking for Danny Martin Gallegos, 49, and Juan Carlos Diaz-Arevelo, 27, who climbed a perimeter fence Sunday at the Daggett County jail, about 120 miles east of Salt Lake City, near the Wyoming border.

"We have a fixed-wing aircraft coming in to help with the search. We have SWAT teams combing the town," said Shari McKee, a sheriff's assistant.

Daggett County is in a remote corner of eastern Utah, an area of national forest, government rangeland and Flaming Gorge National Recreation Area. Manila, the county seat, has a population of 303.

The men turned up missing during a head count at 8 p.m. Sunday, six hours after they were last seen at the jail wearing gray sweats, said Jack Ford, a spokesman for the Utah Department of Corrections.

Diaz-Arevelo was convicted of murder and child abuse in 2006. Authorities say Lindsey Fawson, 22, was shot in the face with a sawed-off shotgun in 2005 in Draper, a Salt Lake City suburb.

Gallegos was convicted of aggravated murder in 1991 in Salt Lake County. He pleaded guilty to shooting an 18-year-old woman after hiding in the apartment of an ex-girlfriend. He was denied parole in 2005.

Because of overcrowding, the two men had been transferred to the jail from the state prison during summer, Ford said.

Ellsworth believes the escapees may have fled to urban areas to "feel safer." They are less than 6 feet tall and weigh 140 to 150 pounds. Gallegos has "AMID" tattooed on his abdomen.

"The more exposure we get of their photographs and descriptions, the better," the sheriff said.