A note with a caption "Have a nice day" left on an opening in the pipe, where two inmates are suspected to have cut open as part of their escape from Clinton Correctional Facility in Dannemora, New York, is seen in this New York Governor's Press Office handout photo taken June 6, 2015 and released on June 7, 2015. Two convicted murderers who used power tools to break out of a maximum security New York prison may have had help, and they left a taunting note for their jailors to "Have a nice day," authorities said on Sunday. [Photo/Agencies]

NEW YORK - Two convicted murderers who used power tools to break out of a maximum security New York prison may have had help, and they left a taunting note for their jailors to "Have a nice day," authorities said on Sunday.

More than 200 local, state and federal law enforcement officials set up roadblocks, took to the air and went door-to-door in their search for Richard Matt, 48, and David Sweat, 34, who went missing early Saturday morning from the Clinton Correctional Facility in Dannemora, about 20 miles (30 km) south of the Canadian border.

"We are leaving no stone unturned. They could be literally anywhere," New York State Police Major Charles Guess told a news conference.

New York is offering a $100,000 reward for information leading to the apprehension of the men it describes as dangerous and have notified law enforcement in Canada and Mexico about the fugitives.

"We presume that they may have had access to a vehicle as well as they may have had assistance in their escape effort," Guess said.

A spokesman for the Ontario Provincial Police in Canada said an alert was issued to all police agencies to be on the lookout for the escapees.