Two Georgia inmates serving long prison sentences and "dangerous beyond description" overpowered and killed two guards on a prison bus before fleeing in a stolen car, authorities said.

The deadly escape happened about 6:45 a.m. Tuesday as the guards drove 33 inmates between prisons, and it set off a massive manhunt involving local, state and federal officers, Putnam County Sheriff Howard Sills said.

Sills was emotional as he described the scene.

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

Donnie Russell Rowe, serving life without parole, and Ricky Dubose, who has prominent tattoos on his face and neck, overpowered, disarmed and killed Sgt. Christopher Monica and Sgt. Curtis Billue and then carjacked a driver who happened to pull up behind the bus on a rural highway, Sills said.

They got into the "grass green," four-door 2004 Honda Civic with the Georgia license plate number RBJ-6601 and drove west on state Highway 16 toward Eatonton, southeast of Atlanta.

"We are still desperately looking for these two individuals. They are armed with 9 mm pistols that were taken from these correctional officers. They are dangerous beyond description. If anyone sees them or comes into contact, they need to call 911 immediately," the sheriff said.

The two inmates got a head start by taking and tossing the Honda driver's cellphone and leaving the other 31 prisoners locked inside the bus, Sills said.

"My biggest worry is they're going to kill somebody else," Sills said.

Later Tuesday, the manhunt shifted about 25 miles (40 kilometers) to the north to the city of Madison, where Sills said the two men burglarized a house and then two men fitting their descriptions were reportedly seen in a Family Dollar store less than a mile away. Authorities had no further signs of the inmates and had no reason to believe they had split up, Sills said.

Multiple agencies contributed to a reward of $60,000 for information leading to the arrests of the two inmates, Georgia Bureau of Investigation spokeswoman Nelly Miles said.

Monica and Billue were both transfer sergeants at Baldwin State Prison. Monica had been with the Georgia Department of Corrections since October 2009 and Billue since July 2007.

How the two inmates managed to reach and overpower the guards remains under investigation, Sills said.

"They were inside the caged area of the bus," he said. "How they got through the locks and things up to that area I do not know."

Protocol is to have two armed corrections officers on the bus, but the officers don't wear bullet-proof vests during transfers, Corrections Commissioner Greg Dozier said.

"We lost two of our fellow officers, two of our kin. We see our officers as our family," Dozier said.

Monica was 42 and leaves behind a wife, Dozier said. Billue was 58 and is survived by his father, five sisters, two brothers and two sons, said Jim Green, an attorney who's speaking for the Billue family.

"Officer Billue's family asks for prayers for all of those who are now placing their own lives at risk to bring these men to justice and asks anyone who has information that may assist in apprehending these perpetrators to please contact law enforcement," Green said in an email.

The guards were moving the inmates to a diagnostic prison in Jackson, where their next placement was to be determined, Dozier said, adding that inmates do not know their transfer dates ahead of time.

Georgia Gov. Nathan Deal pledged every state resource necessary to catch the pair.

"The selflessness and courage of these two brave souls will not be forgotten, nor will their sacrifice and service," Deal said in an emailed statement.

U.S. Deputy Attorney General Rod Rosenstein said federal resources are being committed to help catch the fugitives. The FBI and U.S. Marshals have joined the investigation, Sills said.

"An attack on any American law enforcement officer is an attack on every American law enforcement officer and the principles we all believe in," Rosenstein told a Senate budget panel in Washington Tuesday morning.

Both escaped inmates were serving long sentences for armed robbery and other crimes. The Department of Corrections said Rowe, 43, has been serving life without parole since 2002, and Dubose, 24, began a 20-year sentence in 2015.

A photo released by the sheriff's office in Elbert County, the site of his most recent conviction, shows Dubose with prominent tattoos. He appears to have a crown tattooed above his right eyebrow, writing above his left eyebrow and large letters covering the entire front of his neck.

"They need to surrender before we find 'em," Sills said.

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Associated Press writers Kathleen Foody in Atlanta and Russ Bynum in Savannah, Georgia, contributed to this report.