Pennsylvania ? As the 3-day-old gray kitten cried softly for food Tuesday, a volunteer swaddled him in a towel and fed him formula from a dropper.

The newborn is among about 350 sick and neglected cats removed in a raid from a suburban Pittsburgh animal sanctuary. Veterinarians and volunteers have been working around the clock since Thursday to nurse them back to health.

Dozens of other cats have either died, like the gray kitten’s mother, or had to be euthanized. The survivors are being treated in a makeshift animal hospital in northwestern Pennsylvania.

The cats can’t be adopted yet, in part because they are considered evidence in the case against the owner of the animal sanctuary. Linda Bruno, 45, has been charged with 14 counts of animal cruelty and neglect, and authorities say more charges are expected.

The raid also uncovered burial pits containing perhaps thousands of cats. About 100 dead cats were found in freezers.

Bruno’s preliminary hearing is scheduled April 3.