CBS affiliate KDKA reported that Pollard was last seen around 5 p.m. Monday searching for her cat Pepper. Pollard's family contacted state police at around 1 a.m. Tuesday morning to report that she had not come home.

The authorities in Pennsylvania said they had been searching the sinkhole for the 64-year-old woman, and would continue until she is found.

Rescuers are searching for a missing Pennsylvania grandmother who is believed to have fallen deep into a sinkhole while searching for her cat with her young granddaughter, authorities said.

First responders in Westmoreland County are searching for a 64-year-old woman who reportedly fell in a 30-foot sinkhole in Unity Township.

Pennsylvania, where a grandmother disappeared this week, is one of the states where sinkholes are most common in the U.S.

As the search for Elizabeth Pollard stretches into another day, police and rescue crews said they remain hopeful despite the mine being considered "unstable."

The search entered day two on Wednesday. Pennsylvania troopers worry the abandoned mine where search efforts are underway is becoming unsafe, a report says.

Rescuers continue search for a woman who apparently fell into a sinkhole while looking for her lost cat above an old coal mine in Pennsylvania.