CNN — Investigators believe convicted murderer Danelo Cavalcante escaped from the Chester County Prison in Pennsylvania last Thursday by climbing onto the roof and fleeing from there, a law enforcement source told CNN.

About 200 law enforcement personnel searching for Cavalcante in eastern Pennsylvania are now hoping to “stress him” out of hiding as the manhunt stretches into its seventh day, a US Marshals Service official said.

Searchers are locked in a “game of tactical hide and seek,” with the escaped inmate, who is extremely dangerous, Robert Clark, supervisory deputy US marshal for Pennsylvania’s eastern district said Tuesday.

Pennsylvania State Police are scheduled to provide an update on the manhunt at 3 p.m. ET Wednesday.

Another inmate escaped from the prison on May 19 by climbing onto the roof and dropping down to a less secure area, court documents obtained by CNN show. The inmate, Igore Bolte, told police he was able to scale a wall in an exercise area by putting his legs against one wall and his arms on another until he was able to pull himself onto the roof.

Bolte didn’t make it far. Prison officials caught him in a residential neighborhood less than a mile from the prison just five minutes after his escape.

Chester County District Attorney Deb Ryan acknowledged that escape during a news conference Monday. “The prison is very aware of whatever vulnerabilities they had, and they have made efforts to correct those vulnerabilities,” Ryan said.

Officials are refusing to explain publicly how Cavalcante escaped.

The manhunt has put the community on edge and forced two school districts to close for the second day in a row. Police are advising residents to keep their doors and cars locked after several sightings of Cavalcante in the area.

Cavalcante, 34, escaped from the prison – around 30 miles west of Philadelphia – on Thursday morning. Immediately after his escape, authorities began a multiday search within 2 miles of the prison in a heavily wooded area of Pocopson Township and Chester County.

The search perimeter expanded a little this week after a trail camera recorded Cavalcante on Monday at Longwood Gardens, a popular botanical garden nearly 3 miles from the prison, and just south of where police had been looking for him.

A Reverse 911 call was sent to residents within a 3-mile radius of that spot on Tuesday morning, asking them to lock their doors and vehicles and report any suspicious activity to police.

“There’s a lot of ravines, a lot of tall fields, a lot of grass, a lot of hiding spaces for a guy that is 5 foot, 120 pounds,” Clark said.

Authorities hope to keep Cavalcante moving and force him to make a mistake, Clark said.

“We plan to stress him. We plan to move him,” Clark said. “We plan to have him make mistakes – which he has already made now. He has appeared on camera two times.”

The plan is to make sure he doesn’t get too comfortable, Clark said. Authorities say it appears Cavalcante had somehow obtained some items, including a backpack, a “duffel-sling type pack,” and a hooded sweatshirt.

“We are going to get boots in the woods. We are going to let him know we are there. We are going to leave no rock unturned. We are going to check every little hiding spot,” Clark said. “And should we miss him, we are going to go back in again the next day.”

Cavalcante was convicted of first-degree murder on August 16 in the killing of his former girlfriend, 33-year-old Deborah Brandão, in 2021. He was sentenced to life without parole. He is also wanted in a 2017 homicide case in Brazil, his native country, according to Clark.

Brandão’s sister told CNN she has been living in fear since Cavalcante’s escape, she told CNN. “I was desperate, desperate, very scared. I thought about my children, obviously,” Sarah Brandão said.

She is worried Cavalcante will come after her or show up at her home and has had trouble sleeping. “I have been waking up with fright at night,” she told CNN. She believes police will catch Cavalcante, she said.

While police haven’t seen anything to suggest Cavalcante has obtained a weapon, he is being treated as “armed and dangerous” because of his history, Clark said.

“This is a dangerous, dangerous man. He’s got nothing to lose,” Clark said.

Ryan Drummond of Pocopson Township told CNN affiliate WPVI he believes he saw Cavalcante inside his home last week. Drummond said he got up to investigate after hearing a noise from downstairs at around 11:45 p.m. Friday.

“What I decided to do was flip the light switch on and off three or four or five times, pause, and then he flipped the light switch from downstairs three or four times, which was the moment of, like, ‘Oh my God, this guy’s down there,’” Drummond said.

Drummond said he then watched as Cavalcante took food and walked out of his home. US marshals came to the home Sunday, searching the woods alongside his property, according to Drummond.

Cavalcante was spotted on a surveillance camera early Saturday about 1.5 miles from the prison, before being captured on camera again at Longwood Gardens at 8:21 p.m. Monday, authorities said.

Monday’s sighting signaled to police that Cavalcante was south of the original search area, and they expanded the perimeter to cover that area, Bivens said.

Meanwhile, Longwood Gardens, which boasts “nearly 200 acres of lush, formal gardens, open meadows, and winding paths,” was closed Tuesday as police searched the property and surrounding area.

Kennett Consolidated School District, which is about 9 miles from the prison, and the Unionville-Chadds Ford School District, about 5 miles from the prison, announced closures Tuesday and Wednesday.

Police may place Cavalcante in a different facility once he is captured, Clark said.

“He is going to be brought in and placed in a secure facility where he’s not going to be able to break out again. I can assure you that,” Clark told CNN.

Authorities have tried broadcasting from police helicopters and patrol cars a message in Portuguese from Cavalcante’s mother encouraging him to surrender, Clark said.

“We are trying to use some of that psychology that, if he is tired and he is desperate and he is thinking about maybe giving up, maybe this will put him over the edge to have a peaceful surrender,” Clark said.

CNN’s Danny Freeman, Linh Tran, Andy Rose, Alisha Ebrahimji, Artemis Moshtaghian and Celina Tebor contributed to this report.