Authorities fear a Pennsylvania woman was swallowed by a sinkhole while looking for her cat

Authorities fear a grandmother who disappeared while looking for her cat may have been swallowed up by a sinkhole that recently opened up in a western Pennsylvania village.

Crews lowered a pole camera with a sensitive listening device into the hole in Marguerite on Tuesday morning but detected nothing. A second camera lowered into the hole showed what could be a shoe.

The family of Elizabeth Pollard, 64, called police at about 1 a.m. Tuesday to say she had not been seen since going out Monday evening to search for Pepper, her cat.

Police said they found Pollard's car parked near Monday's Union Restaurant in Marguerite, about 40 miles (65 kilometers) east of Pittsburgh. Pollard's 5-year-old granddaughter was found safe inside the car.

The manhole-sized opening had not been seen by hunters and restaurant workers who were in the area in the hours before Pollard's disappearance, leading rescuers to speculate the sinkhole was new.

Authorities used an excavator to dig in the area, where temperatures dropped to below freezing overnight.

“We are pretty confident we are in the right place. We’re hoping there is still a void she could be in,” Pleasant Valley Volunteer Fire Company Chief John Bacha told Triblive.

Trooper Steve Limani said the shoe was about 30 feet (9 meters) below the surface.

“It almost feels like it opened up with her standing on top of it,” Limani said.

Pollard lives in a small neighborhood across the street from where her car and granddaughter were located, Limani said.

The young girl “nodded off in the car and woke up. Grandma never came back," Limani said. The child stayed in the car until two troopers rescued her. It's not clear what happened to Pepper.

Police said sinkholes are not uncommon because of subsidence from coal mining activity in the area.

A team from the Pennsylvania Department of Environmental Protection, which responded to the scene, concluded the underground void is likely the result of work in the Marguerite Mine, last operated by the H.C. Frick Coke Company in 1952. The Pittsburgh coal seam is about 20 feet (6 meters) below the surface in that area.

Department of Environmental Protection spokesperson Neil Shader said the state’s Bureau of Abandoned Mine Reclamation will examine the scene after the search is over to see if the sinkhole was indeed caused by mine subsidence.