Married murder suspects still on the run a week after escaping police.

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Federal authorities have released new images of a pair of murder suspects who overpowered security guards and escaped from a prison transport van last week.

The photos were taken at San Juan County Jail where Blane Barksdale, 56, and his wife Susan Barksdale, 59, were housed the night before they escaped last Monday, U.S. Marshals said Saturday.

"These updated photos of Blane and Susan Barksdale were taken shortly before overpowering the transport team outside of Blanding, Utah," U.S. Marshal David Gonzales said in a release Saturday. "We are asking anyone who knows of their whereabouts or sees them to call the U.S. Marshals Service or 9-1-1 immediately."

The couple was being extradited from New York to Pima County, Arizona, when they allegedly rushed two unarmed security guards in Utah, tied them up and took control of the transport van, U.S. Marshals said.

Gonzales told The Associated Press that Susan Barksdale complained of an "intestinal issue" before she and her husband charged the guards. The Barksdales used shoelaces to tie up the guards and placed them in the back of the van with an unidentified third inmate, Gonzales said.

The Barksdales then allegedly drove the van to northeast Arizona, where they abandoned it, with the guards still "tied up in the van," according to the U.S. Marshals Service.

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