DANNEMORA, N.Y. – Authorities said Monday the two killers who made a Hollywood-style escape from New York’s top-security prison had accomplices inside and outside the 30-foot high concrete-and-steel walls.

Gov. Andrew Cuomo said the escapees had to receive help within the prison in this far northeast New York town to know the interior layout and to get the power tools to make the sophisticated breakout.

The governor said it is quite probable they also had assistance in fleeing after they emerged from a street manhole a block outside the prison.

“It was a sophisticated plan,” said Cuomo. “It took a period of time to execute. They had help.”

Authorities questioned guards, civilian workers, vendors and contractors who worked at the prison while more than 250 state and federal law enforcement authorities spread a dragnet across hundreds of miles of wooded and hilly terrain surrounding the prison 25 miles from the Canadian border.

A female civilian industrial supervisor in the maximum security prison said to be friendly with the escaped prisoners was the focus of intense questioning as a possible accomplice. She oversaw production operations in the tailor shop and trained inmates in manufacturing processes.

Cuomo said failure to recapture the fugitives promptly has created a public safety crisis that state and federal law enforcement officers were working around-the-clock to end.

“These are killers,” he said. “These are murderers. Our first order of business is apprehending them.”

Sought are David Sweat, 34, who was serving life without parole for the 2002 murder of a sheriff’s deputy, and Richard Matt, 48, sentenced to 25 years to life for kidnapping, killing and dismembering his former boss in 1997.

Taking a cue from the prison-break movie “The Shawshank Redemption,” the pair fooled nighttime guards making their cell block walk-by rounds by putting hoodie-clad dummies in their beds, used power tools to cut rectangular holes through the steel walls at the back of their adjoining cells, climbed onto a six-story catwalk, then slid down a series of pipes to the bowels of the prison.

There they broke through a thick brick wall, cut a hole in two-foot diameter drain pipe, and shimmied their bodies for a city block to a manhole outside the prison, cutting a steel chain and lock to open the cover.

The escapees left a taunting sticky yellow note on the cut drain pipe, telling authorities to “Have A Nice Day!” The note included a racist caricature of a bucktoothed Asian.

It was the first escape from the maximum security prison — known locally as “Little Siberia” because of its far north location and hard winters — since the facility was built 150 years ago.