We think they have binoculars and could be on a higher altitude,'' said Jerry Massie, a spokesman for the state Corrections Department. Members of the Oklahoma National Guard have used night vision technology to search for the convicts. But thick foliage in the mountainous area in southeast Oklahoma could interfere with infrared sightings, Oklahoma Highway Patrol spokesman Lt. Chris West said. Davis and Gray hid in a mail cart that was driven out of the facility by a corrections employee.
Authorities allege the men then stole a pickup truck at knifepoint and later abandoned it.
The escapees also are alleged to have broken into a house, stolen a car and taken two rifles, authorities said. On Saturday, bloodhounds picked up a scent and followed it to a creek where officers found some clothing believed to belong to the convicts and an empty box of ammunition. About 250 officers from a dozen agencies are helping with the search. Davis is white with brown hair and brown eyes. Gray is white with blond hair and blue eyes.