(CNN) Two prisoners involved in the fatal shootings of two corrections officers on a bus Tuesday morning in central Georgia apparently have ditched their prison uniforms for stolen clothes.

An expanding manhunt is underway for Donnie Russell Rowe, 43, and Ricky Dubose, 24.

They were on a state corrections bus with 31 other inmates about 6:45 a.m. when the pair somehow got out of what should have been a locked, gated rear section of the bus, officials said.

Rowe and Dubose entered the driver's compartment and overpowered and disarmed Officers Christopher Monica and Curtis Billue while the bus was on State Route 16 between Eatonton and Sparta, Putnam County Sheriff Howard Sills said.

At least one of the prisoners shot and killed Monica and Billue, Sills said. They may be armed with the officers' Glock pistols.

Investigators will analyze footage from video cameras on the bus to determine how they got free and who pulled the trigger, the sheriff said. But as long as the suspects are missing, he called the matter of who opened fire "immaterial" for now.

"They are dangerous beyond description," Sills told reporters Tuesday. "They need to surrender before we find them."

Sills said later the duo had ransacked a random house, took some food and may have stolen some clothes.

The sheriff said there was no reason to believe the two have split.

'I have their blood on my shoes'

Rowe and Dubose carjacked an approaching green 2004 four-door Honda Civic with Georgia license plate RBJ6601. After forcing the driver out, the two drove west toward Eatonton, Sills said. Dubose had a prior arrest in the area but no family connections, the sheriff said.

The escaped prisoners carjacked this 2004 Honda Civic, the Putnam County Sheriff's Office said.

Monica, 42, and Billue, 58, were transporting the inmates from Hancock State Prison, in adjacent Hancock County, to the Georgia Diagnostic and Classification Prison, some 45 miles west of Eatonton, Georgia Department of Corrections Commissioner Greg Dozier said.

Rowe and Dubose most recently were inmates at Baldwin State Prison in nearby Milledgeville, the corrections department said. It wasn't immediately clear why or for how long they were at the Hancock prison, or why they were being taken to the diagnostic prison.

The other prisoners were still on the bus, with doors closed, when authorities arrived at the scene, he said.

Remembering our two Baldwin State Prison officers tragically killed today - Christopher Monica hired 10-16-09 & Curtis Billue hired 7-16-07 — Georgia Corrections (@GA_Corrections) June 13, 2017

The sheriff was emotional as he recounted what he saw when he arrived on the scene.

"I saw two brutally murdered corrections officers; that's what I saw," Sill said. "I have their blood on my shoes."

Reward offered

Gov. Nathan Deal said the state will use all available resources to track the fugitives down.

"Today, two families lost everything in a heinous and senseless act of violence perpetrated at the hands of cowards," Deal said. "Our heartbreak is matched only in our resolve to bring their murderers to justice."

The Georgia Bureau of Investigation (GBI) has raised the reward to $70,000 from $60,000, according to their verified Twitter account

The sheriff of Oconee County, whose jurisdiction is north of where the killings occurred, wrote a post on Facebook to the escaped convicts.

"Donnie and Ricky, I hope you are reading this. What is done is done. However, I am asking you to surrender yourselves to the nearest law enforcement officer as soon as possible. You made your escape, but you won't be out long. ... There is no one you can trust ... and nowhere you can go that we won't find you," the sheriff wrote.

Bus was going from one prison to another

It is standard protocol to have two officers -- armed but not wearing ballistic vests -- transport prisoners on a bus, said Dozier with GDOC.

Monica, a sergeant, worked for the department for almost eight years and leaves a wife. Billue, a 10-year employee, is survived by a father, a brother and a sister, Dozier said.

Rowe, who is 6 feet 1 inches tall and 181 pounds with blue eyes and brown hair, was serving a sentence of up to life in prison for armed robbery and aggravated assault in a 2001 case, according to the Georgia Department of Corrections website

CNN Map

Dubose, 6 feet 1 inches tall and 140 pounds with blue eyes and brown hair, was sentenced up to 20 years in prison for armed robbery, aggravated assault and theft in 2014, the website shows. He also was convicted of theft and identity fraud in cases from August 2010.

The other prisoners on the bus were taken to the sheriff's office where about 3 p.m. some of them were put on another corrections department bus. Two guards with long guns watched as the prisoners, wearing cuffs on their ankles and wrists, shuffled toward the transport.

Eatonton, Putnam County's seat of government, is about 65 miles southeast of Atlanta.