(Rob Fountain/The Press-Republican via AP)

Manhunt, Day Seven: Two convicted killers who pulled off an elaborate escape from a maximum-security prison in upstate New York were still on the lam Friday as the search intensified.

[The dangerously charismatic escapee at the center of the N.Y. manhunt]

More than 800 law enforcement officers are now looking for fugitives Richard Matt and David Sweat, who used power tools to break out of Clinton Correctional Facility in Dannemora, N.Y., last Friday night or early Saturday morning.

A local prosecutor said police tracking dogs picked up the fugitives’ scent at a gas station not far from the prison, then followed it east, to the town of Cadyville.

[Police dogs picked up the scent of escaped killers near New York prison]

The New York State Police said the search is focused along State Route 374, in the town of Plattsburgh on the Saranac River.

Here are some scenes from the area in northeastern New York where the ground search is focused.

A law enforcement officer looks into the woods Friday. (Eric Thayer/Getty Images)

Jennifer Hilchey-Reyell carries a rifle at her mother’s house near Dannemora, N.Y., on Thursday. (Seth Wenig/AP)

Officers on Wednesday question a woman who lives near the prison. (Seth Wenig/AP)

An agent looks through a sniper scope over a field in Boquet, N.Y., on Tuesday. (Seth Wenig/AP)

A roadblock in the search area. (Eric Thayer/Getty Images)

Police work a roadblock on Friday. (Eric Thayer/Getty Images)

A trooper examines a tractor-trailer Friday in West Plattsburgh, N.Y. (Eric Thayer/Getty Images)

A wanted poster in the window of a New York State Police car near Dannemora on Friday. (Seth Wenig/AP)

Heidi Golden and her daughter, Reaganne, sit on the front steps of their Dannemora home Thursday. (Chris Wattie/Reuters)

An officer waves to a school bus before his search team enters the woods Monday. (Mike Groll/AP)

Law enforcement officials near Cadyville, N.Y., on Thursday. (Chris Wattie/Reuters)

A helicopter flies over thick woods on Thursday. (Tim Roske/AP)

An officer looks through binoculars on Tuesday (Seth Wenig/AP)

An agent and dog on the search Wednesday in Dannemora. (Rob Fountain/The Press-Republican via AP)