Susan Powell search: A mother who disappeared in 2009 could be buried on a farm in Oregon.
Authorities went to the farm based on a tip to look for Powell, a resident of Utah, but after two days of searching have found nothing.
"The leads have become fewer and farther between," said Wayne Pyle, the city manager for West Valley City, Utah.
"If nothing comes from it, we do feel like we are close to the end of the investigation."
The search of the farm started after Chuck Cox, Susan's father, received a call saying her husband Josh's aunt and uncle had lived on a 180 acre farm in Oregon, according to ABC.
KSL-TV reported that Josh, a person of interest in the case, spent a lot of time at the farm.
Josh Powell locked a social worker out of his home at the start of a supervised visit, then killed himself and the couple's two young children, attacking his sons with a hatchet and then setting the house ablaze.
Police officers are continuing to search the property for human remains and are interviewing neighbors in the area.
Cox said he appreciated the search.
"These people are dedicated, and I'm just heartened that they will never give up," he said.
The Associated Press contributed to this report.