State police are back at a landfill in Putnam as they continue to search for an Easton couple who disappeared in early August.
The Putnam Ash Residue Landfill, a 186-acre site operated by Wheelabrator Technologies, is used to dump ash from all the state's waste-to-energy plants.
State police have been searching it in connection to the case of Jeffrey and Jeanette Navin, who disappeared from their Easton home on Aug. 4, shortly after moving from Westport, state police said.
On Friday, State police spokesman Trooper First Class Kelly Grant said detectives have been searching the landfill, but would not elaborate on the details of the probe.
Search warrants NBC Connecicut obtained on Friday revealed some new details in the case, including that no phone calls have been made from the couple's cell phones since the day they disappeared, and those phones have since been turned off.
As of last week, state police said they had not found any human remains at the landfill, which they said they were searching "in an effort to rule it out as a possible location."
Five days after the couple disappeared, a state trooper found the couple's pickup in a Westport commuter lot, according to authorities.
It had a broken window and investigators have taken more than a dozen swab samples from the vehicle, according to the warrants.
Sources also told NBC Connecticut the couple's son, Kyle Navin, has been named a person of interest in his parents' disappearance.
Kyle Navin told police that his parents visited him in Bridgeport the morning they vanished and asked to take him to dinner. according to warrants, but Kyle said he had a broken back and declined. That was the last anyone heard from Jeffrey and Jeanette Navin.
Jeffrey Navin serves as president of the J&J Refuse waste management company in Westport, while Jeanette works as a school library aide in Weston.
Kyle Navin, who is listed online as operations manager of J&J Refuse, told police the family was in the process of selling the company, according to warrants obtained by NBC Connecticut.
About a week before the Navins vanished, a judge denied Jeffrey Navin's motion to reopen a case appealing more than $2.2 million in debt on a $900,000 Guilford home. Other relatives have said they don't believe the couple's finances factored into their disappearance.
Police have also searched the couple's current and former homes and one of their bank accounts.
State police ask anyone who knows where Jeffrey and Jeanette Navins are or who has any information to call state police at 860-685-8190. All calls will remain confidential.