Two murderers who escaped from an upstate New York prison remain at large as the manhunt enters its 11th day.

More than 800 law enforcement officers are keeping up an intense search for Richard Matt and David Sweat, who escaped from the Clinton Correctional Facility near the Canadian border June 6.

On Monday, a woman charged with helping the killers flee the maximum-security prison by providing them hacksaw blades, chisels and other tools made a second court appearance.

Joyce Mitchell entered court in Plattsburgh wearing a striped prison jumpsuit and a bulletproof vest.

Prosecutors say the 51-year-old Mitchell agreed to be the getaway driver but backed out because she still loved her husband and felt guilty for participating.

Mitchell was an instructor in the prison tailoring shop.

(AP)