After a quiet few days following an exhaustive multiple-week search for Brian Laundrie with no luck finding him, police activity has once again resumed at the entrance to the Carlton Reserve.

Allyson Henning, a reporter for WFLA, an NBC affiliate, reported a large law enforcement presence at the Venice end of the reserve around 9:30 a.m. Thursday, and a photojournalist for the station also flew over the area later in the day and was able to see unites searching through the reserve.

A public information manager for the Pasco County Sheriff’s Office later told WFLA that two K9 human remains detection units (HRD) and a K9 trainer from the force were present, along with the North Port Police Department, Sarasota County Sheriff’s Office and FBI.

“We have sent the HRD K9s a few times and patrol K9s (who are also trained to track those who are missing) a few times,” the spokesperson said. “For more insight, we’re one of the only law enforcement agencies in Florida that have HRD K9s in-house, so we’re often requested to assist in that aspect across the state.”

The activity comes as more famous names have joined in on the search to try and locate Laundrie, who has been a person of interest in the death of his former girlfriend, Gabby Petito, for a month.

In addition to Duane “Dog The Bounty Hunter” Chapman, who had joined the search, John Walsh, known for his time as host of “America’s Most Wanted” and “In Pursuit with John Walsh,” is also weighing in, telling Fox News that he believes Laundrie’s parents are not innocent when it comes to his still not being found.

“I absolutely believe that his family is helping him stay on the run,” Walsh said.

As for activity at the reserve Thursday, Henning also took to Twitter to update that police were still there around 5:45 p.m. Eastern.