- Ground under sinkhole becoming unstable as rescuers search for Pennsylvania grandmother CNN
- Woman Looking for Cat May Have Fallen Into Sinkhole, Authorities Say The New York Times
- Abandoned mine at the heart of search for woman who fell through a sinkhole is becoming unsafe, police say CBS Pittsburgh
- Missing grandmother believed to have fallen into sinkhole: Police ABC News
- What to know about sinkholes after a Pennsylvania woman may have disappeared into one The Associated Press