Hundreds of law enforcement officers have stepped up their search in western New York state for two convicted murderers who escaped from an upstate prison more than two weeks ago, as another possible sighting of the men was reported in the area.
The manhunt is centered on the town of Friendship, located about 450km southwest of the Clinton Correctional Facility in Dannemora, where the escaped convicts were serving sentences for murder.
"We will continue to search this area until all leads have been exhausted," New York State Police Major Michael Cerretto said.
"As we have in other areas of this state, we will search under every rock, behind every tree and structure until we are confident that that area is secure."
State police received a call on Saturday afternoon from a witness who spotted two men with descriptions similar to the escaped convicts, Richard Matt and David Sweat, on a railroad line in Friendship, Mr Cerretto said.
Police interviewed the witness at length and determined that the witness was credible and the lead should be investigated, Mr Cerretto said, calling the sighting "unconfirmed."
He added that about 300 law enforcement officers were searching along New York's so-called southern tier, near the border with Pennsylvania. That is double the number that state police said were on the ground on Saturday.
A secure perimeter was established around the area of the sighting and roadblocks were set up, Mr Cerretto said at a brief press conference. He made no mention of other sightings in the area.
The Buffalo News reported that a civilian told police that he believed he had seen two men fitting the descriptions of the convicts walking along a road in Friendship this morning.
The reported sightings of Matt, 48, and Sweat, 35, follow the suspension of a corrections officer at Clinton Correctional Facility in connection with the escape.
Joyce Mitchell, 51, a training supervisor in the prison tailor shop, is charged with helping the inmates escape by giving them hacksaw blades. She had planned to drive their getaway car but lost her nerve and instead checked into a hospital with a panic attack, authorities said.
The two inmates cut through their cell walls and crawled through a steam pipe before emerging from a manhole outside the prison, authorities said. The pair was discovered missing during the morning bed check on 6 June.
