Two convicted murderers have used power tools to cut through steel walls and escape from a maximum-security US prison near the Canadian border.
New York governor Andrew Cuomo said 48-year-old Richard Matt and 34-year-old David Sweat are "dangerous individuals" who escaped through an elaborate plot. Officials are trying to determine where they got the power tools.
Mr Cuomo spoke at the Clinton Correctional Facility in Dannemora after joining law enforcement authorities to trace the men's escape route.
Authorities said Matt and Sweat were discovered missing from the prison thismorning.
Sweat is serving a sentence of life without parole over the murder of a Broome County sheriff's deputy in 2002. Matt is serving 25 years to life for the killing of a man in 1997.