The attorney general's office did not say how many facilities it is investigating, or reveal their names or provide any other details about the specific allegations. In general, the attorney general's office has jurisdiction in manners of criminal neglect.
"We will hold nursing facilities and caretakers criminally accountable if they fail to properly provide care to our loved ones," Attorney General Josh Shapiro said in a written statement. "While we salute and appreciate nursing home staff on the front lines during this pandemic, we will not tolerate those who mistreat our seniors and break the law."
He said "active criminal investigations" are underway.
Messages seeking comment were left with a pair of nursing home industry trade groups, LeadingAge PA and the Pennsylvania Health Care Association.
The virus has sickened about 12,000 residents of 540 nursing and personal care homes, accounting for about one-fifth of the state's confirmed infections, according to the Health Department. The National Guard has been deployed to more than a dozen homes with severe outbreaks.
Shapiro's involvement comes as the administration of Gov. Tom Wolf rolls out a plan to begin universal coronavirus testing of every resident and employee of nursing homes and other facilities that provide care for older adults.
Wolf said Tuesday his administration will undertake the surveillance testing, with a goal of testing every resident and employee once a week, given the pandemic's tremendous toll on nursing homes.
"What we are going to do, which I think is fairly radical, is make sure that we are doing surveillance testing," Wolf said on a telephone news conference.
Wolf's health secretary, Dr. Rachel Levine, had previously said there was not enough available testing to test everyone in a nursing home. But on Tuesday, she announced new changes.
"We are announcing a robust universal testing strategy for all staff and residents in these facilities," she said. "This effort will give us a clearer picture of outbreaks in nursing homes and a clearer picture of stopping them."
She also had previously said that testing everyone wasn't useful unless they were to be repeatedly tested to continue checking to see whether they became infected later.
Attorney and elderly advocate, Marty Kardon, wants more. He sued the state earlier this month, demanding nursing home inspectors go into facilities and check for infection control protocols and look for clues of neglect.
"It all gets down to inspections. You got to have eyes on the ground, to know what is being done is sufficient," he said.
Pennsylvania added more than 800 new infections and 75 deaths to the state's COVID-19 toll on Tuesday.
Overall, the Health Department said more than 3,800 people in the state have died from the pandemic and nearly 58,000 have been sickened.