Local, state and federal authorities have set up a search perimeter in Willsboro. NY, searching for the David Sweat  and Richard Matt, the two convicted murderers on the run since Saturday night from the Dannemora Prison, according to CNN.

Authorities scoured farms and fields around the upstate New York town on Tuesday,

The search was prompted by a citizen who spotted two "suspicious men" walking down a road in Willsboro in the middle of a "driving rainstorm" overnight "in an area that's all ... large farms and fields and wooded lots," Town Supervisor Shaun Gillilland said. As the citizen's car approached them, they took off.

Gillilland told CNN  that it was his understanding that people outside that area aren't in special danger. As of 2 p.m., the town supervisor wasn't aware that any clothes, vehicles or other evidence had been found, but it was still relatively early in the process.

The stormy overnight spotting in Willsboro, a town of 2,000 people on Lake Champlain, is one of the first big potential breakthroughs since prison guards found Matt and Sweat's beds empty at 5:30 a.m. Saturday.