FBI agents conduct a search for convicted murderer David Sweat on June 28, 2015 near Duane, New York.
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June 28, 2015 3:25 PM EDT

Poor weather could hinder the search for the remaining inmate still at large after escaping from an upstate New York prison over three weeks ago.

More than 1,300 law enforcement officers are combing Franklin County for David Sweat just two days after his fellow escapee Richard Matt was shot dead by police.

Search crews have remained close together and are building fires to keep warm in response to unseasonable cold, TWC News reported. The high was expected to be below 60°F on Sunday.

Sweat’s DNA was found a mile away from the location where Matt was shot and killed, and police forces have converged on that area. The pair of inmates, both convicted murderers, escaped from Clinton Correctional Facility on June 6.


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Write to Justin Worland at justin.worland@time.com.

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