Law enforcement officers get off a truck as they return to their vehicles after searching a wooded area, June 14, 2015, in Schuyler Falls, New York.
Law enforcement officers get off a truck as they return to their vehicles after searching a wooded area, June 14, 2015, in Schuyler Falls, New York.

Authorities are expanding their search for two escaped killers who broke out of maximum-security prison in northern New York state near the border with Canada.

More than 800 officers are hunting for David Sweat and Richard Matt who escaped from the Clinton Correctional Facility on June 6. State, local and federal law enforcement personnel are involved. Police have mainly focused on a wooded area south of the prison, but say they are expanding eastward.

On Friday, a prison worker was charged with providing the convicts with materials to aid in their escape.

Matt and Sweat used power tools to cut through the back of their cell wall and through steel pipes as they made their escape.

Authorities have received more than 700 leads in the case.

Previously, the longest escape from a New York prison was three days.

Sweat is serving a life sentence for the 2002 death of a sheriff's deputy. Matt is facing 25 years to life in prison on murder, kidnapping and robbery charges following the 1997 killing of a man.

Some material for this report came from AP.