Official: 2 convicts practiced escape plan before breakout

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DANNEMORA, N.Y. (AP) — Authorities say the two murderers who escaped from a maximum-security prison in northern New York conducted a practice run the night before they made their daring breakout.

Clinton County District Attorney Andrew Wylie says David Sweat and Richard Matt made a "dry run" of their escape plan on June 5 by going through an underground utility tunnel connecting Clinton Correctional Facility to the streets of Dannemora.

The men poked their heads out of a manhole, but decided it was too close to nearby homes. Instead, they exited the tunnel early the next morning through a slightly more isolated manhole located just a block from the prison walls.

Matt was shot to death last Friday in Malone by a border patrol officer. Sweat was wounded Sunday by a state trooper near the Canadian border.

See photos from Matt and Sweat's escape:

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Convicted felons escape from NY prison - Escape photos
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Official: 2 convicts practiced escape plan before breakout
UNDATED: In this handout from the New York State Police, a progression image of escaped inmate Richard Matt is seen. Matt and fellow inmate David Sweat escaped from the Clinton Correctional Facility in upstate New York on June 6, and a manhunt for them is ongoing. The image is intended to show what the inmate would look like after almost two weeks on the run. (Photo by New York State Police via Getty Images)
UNDATED: In this handout from the New York State Police, a progression image of escaped inmate David Sweat is seen. Sweat and fellow inmate Richard Matt escaped from the Clinton Correctional Facility in upstate New York on June 6, and a manhunt for them is ongoing. The image is intended to show what the inmate would look like after almost two weeks on the run. (Photo by New York State Police via Getty Images)
PLATTSBURGH, NY - JUNE 15: Joyce Mitchell (L) , a prison worker who allegedly helped two convicts escape from prison, is lead from Plattsburgh Ciy Court after a hearing on June 15, 2015 in Plattsburgh, New York. The convicts, Richard Matt and David Sweat, escaped sometime during the night between June 5 and June 6 from the Clinton Correctional Facility in Dannemora, New York and law enforcement are on a multi-state manhunt for their capture. (Photo by Andrew Burton/Getty Images)
PLATTSBURGH, NY - JUNE 15: Joyce Mitchell (L) appears before Judge Buck Rogers in Plattsburgh City Court on June 15, 2015 in Plattsburgh, New York. Mitchell allegedly aided inmates Richard Matt and David Sweat in their escape from Clinton Correctional Facility. They were discovered missing the morning of June 6. (Photo by G.N. Miller - Pool/Getty Images)
DANNERMORA, NY - JUNE 6: In this handout from the New York State Governor's Office, New York Gov. Andrew Cuomo is shown the escape path where two convicted murderers fled from the Clinton Correctional Facility June 6, 2014 in Dannemora, New York. Police are on a manhunt for Richard Matt, 48, and David Sweat, 34, who escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole. (Photo by Darren McGee/New York State Governor's Office via Getty Images)
DANNERMORA, NY - JUNE 6: In this handout from the New York State Governor's Office, New York Gov. Andrew Cuomo is shown the escape path where two convicted murderers fled from the Clinton Correctional Facility June 6, 2014 in Dannemora, New York. Police are on a manhunt for Richard Matt, 48, and David Sweat, 34, who escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole. (Photo by Darren McGee/New York State Governor's Office via Getty Images)
DANNERMORA, NY - JUNE 6: In this handout from the New York State Governor's Office, New York Gov. Andrew Cuomo is shown the escape path where two convicted murderers fled from the Clinton Correctional Facility June 6, 2014 in Dannemora, New York. Police are on a manhunt for Richard Matt, 48, and David Sweat, 34, who escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole. (Photo by Darren McGee/New York State Governor's Office via Getty Images)
DANNERMORA, NY - JUNE 6: In this handout from the New York State Governor's Office, New York Gov. Andrew Cuomo walks past jail cells where two convicted murderers fled from the Clinton Correctional Facility June 6, 2014 in Dannemora, New York. Police are on a manhunt for Richard Matt, 48, and David Sweat, 34, who escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole. (Photo by Darren McGee/New York State Governor's Office via Getty Images)
DANNERMORA, NY - JUNE 6: In this handout from the New York State Governor's Office, shoes a note where two convicted murderers used power tools to cut through steel pipes at the Clinton Correctional Facility June 6, 2014 in Dannemora, New York. Richard Matt, 48, and David Sweat, 34, escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole. (Photo by Darren McGee/New York State Governor's Office via Getty Images)
DANNERMORA, NY - JUNE 6: In this handout from the New York State Governor's Office, shows where two convicted murderers escaped from the Clinton Correctional Facility June 6, 2014 in Dannemora, New York. Richard Matt, 48, and David Sweat, 34, escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole. (Photo by Darren McGee/New York State Governor's Office via Getty Images)
DANNERMORA, NY - JUNE 6: In this handout from the New York State Governor's Office, shows where two convicted murderers used power tools to cut through steel pipes at the Clinton Correctional Facility June 6, 2014 in Dannemora, New York. Richard Matt, 48, and David Sweat, 34, escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole. (Photo by Darren McGee/New York State Governor's Office via Getty Images)
DANNERMORA, NY - JUNE 6: In this handout from the New York State Governor's Office, New York Gov. Andrew Cuomo (R) is shown the manhole where two convicted murderers escaped from the Clinton Correctional Facility June 6, 2014 in Dannemora, New York. Police are on a manhunt for Richard Matt, 48, and David Sweat, 34, who escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole. (Photo by Darren McGee/New York State Governor's Office via Getty Images)
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