These undated combination booking photos provided by the Tucson Police Department show 56-year-old Blake Barksdale, left, and his 59-year-old wife Susan Barksdale. The couple suspected in a Tucson murder have escaped after overpowering two security guards while being extradited from New York to Arizona, authorities said Tuesday, Aug. 27, 2019. (Tucson Police Department via AP)

These undated combination booking photos provided by the Tucson Police Department show 56-year-old Blake Barksdale, left, and his 59-year-old wife Susan Barksdale. The couple suspected in a Tucson murder have escaped after overpowering two security guards while being extradited from New York to Arizona, authorities said Tuesday, Aug. 27, 2019. (Tucson Police Department via AP)

PHOENIX (AP) — A husband and wife being transported across the country to face murder charges used a medical emergency ruse and then overpowered two security guards, tied them up and left them and a third uninvolved prisoner outside a rural Arizona town, authorities said Thursday.

David Gonzales, the U.S. marshal for Arizona, told The Associated Press that a privately operated prison transport van had departed from Blanding, Utah, on Monday afternoon when Susan Barksdale pretended to have an “intestinal issue.”

“It was compelling enough that they felt the need to pull over,” Gonzales said.

The guards were unarmed and did not feel the need to take a handgun that was inside a locked box. But Susan and Blane Barksdale charged at them once they opened the rear compartment, the marshal said. The male and female guards weren’t physically injured, Gonzales said, but the Barksdales used shoelaces to bind them and then put them in the back with a third inmate. They also took a key to free themselves of a waist restraint.

Blane Barksdale, 56, “is not a big guy but he can be very imposing,” Gonzales said. “I don’t think these two guards were equipped physically and emotionally with the experience needed for these types of individuals.”

The Barksdales drove the van to the town of Vernon, Arizona, where they met up with a friend who gave them access to his red GMC pickup truck. The friend has not been charged but law enforcement continues to question him, Gonzales said.

From there, each drove away in a vehicle for about 40 miles (65 kilometers) and abandoned the van near the town of St. Johns, Arizona. The couple took off with the money in guards’ wallets, which “wasn’t much,” according to Gonzales. They were likely unaware of the handgun, which was still in its box. The guards and the third prisoner were left behind.

“This other prisoner, he wanted no part of this deal,’” Gonzales said. “He was very forthcoming.”

It took the guards two to three hours to break free, eventually kicking out some windows. By the time authorities reached the area, the Barksdales had been gone for several hours. The third prisoner has since been taken to his intended destination — a southern Arizona jail.

The Barksdales were arrested May 24 near Rochester, New York, on suspicion of first-degree murder and other crimes related to the April death of a 72-year-old man in Tucson. Tucson police say a fire followed by an explosion broke out in April at the home of Frank Bligh. His car was found abandoned the next day.

While his body has not been found, investigators say evidence in the car indicated he was likely dead. The Barksdales were later identified as suspects.

Gonzales said multiple agencies including the FBI and Tucson police are interviewing people from Arizona to New York. The Marshals Service on Wednesday offered a $20,000 reward — $10,000 for each suspect — for information leading to their arrest. He believes they are somewhere in the Southwest, possibly Arizona or New Mexico. He also thinks they likely have since shed their prison uniforms.

“In any crime or situation like this, somebody knows something. Sometimes a reward can be that little push to make a call to us,” Gonzales said.

Gonzales said Blane Barksdale has a criminal history and his arms are covered in tattoos, including swastikas. He served two prison terms, according to online records. He spent nearly eight years in Arizona prisons for theft and drug convictions dating to 1984. He was released in January 1993.

Barksdale also was sentenced to 10 years in prison for a 2003 federal marijuana possession convictions in Taylor County, Kentucky, and was released in early 2012, according to records.

In a letter to the judge in the Kentucky case, Barksdale said he was thankful that he didn’t receive a stiffer sentence. “I sir, will not ever make you regret giving us this second chance either,” Barksdale said in the handwritten letter.

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After his release he married Susan Barksdale, now 59, in December 2013.

Officials in Pima County, where Tucson is located, announced Wednesday they were suspending use of the transport company, Security Transport Services, pending a review of the escape. A spokeswoman at the Topeka, Kansas-based company did not immediately return a message seeking comment Thursday.

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Associated Press writer Jacques Billeaud in Phoenix contributed to this report.

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This story has been changed to correct the spelling of David Gonzales’ last name from Gonzalez.