Suspected cop killer taunting police?

It's a dangerous game of cat and mouse; police think suspected cop killer Eric Frein might be taunting them by showing off in public.

On the 13th day of the search, CBS News' correspondent Vladimir Duthiers went to Canadensis, Pennsylvania, where police uncovered more clues about their suspect.

Police made some surprising revelations Wednesday on the progress of the search for Eric Frein. They also continue to ask for help, and patience, from residents in this rural Pennsylvania community.

Pennsylvania State Police say Frein has purposely made himself visible to cops, before falling back into the dense forest he's been using as cover for almost two weeks.

It was the first time authorities acknowledged possible sightings of Frein during the manhunt.

The last sighting, said State Police Lt. Col. George Bivens, came as recently as Tuesday.

"Any sightings that occurred by law enforcement, again we're at a significant distance, there wasn't an opportunity to take a few steps and apprehend him," Bivens said.

Other clues discovered in the wilderness are giving police added confidence that they're closing in on their suspect.

"Some of those items include Siberian cigarettes and soiled diapers that we have found in the area, among many other things," Bivens said.

Officials believe Frein is using diapers to remain stationary for long periods of time.

Cops say other evidence -- like notes and journals -- indicate Frein may have spent years planning the shooting at the Pennsylvania State Police barracks on September 12, where one officer was killed and another, seriously injured.

The ambush attack landed Frein on the FBI's most wanted list, and police have been authorized to use deadly force.

With close to 1,000 law enforcement officers scouring the woods, police offered a piece of advice to the suspect.

"Before this gets any worse for him, before he gets hurt or worse, he needs to surrender," said Bivens. "We're not going away and we will be here until we apprehend him."

Bivens also had a message for residents, asking for any information -- including photos or video of suspicious activity that could lead to Frein's capture.

He also thanked them for their continued patience while their community remains on lock-down.