University Medical Center in Tucson has fired three clinical support staff members and a contracted nurse for "inappropriately accessing confidential medical records," the hospital reported on its website Wednesday.
The records were related to Saturday's shootings at a Tucson supermarket that killed six and wounded 13 -- including U.S. Rep. Gabrielle Giffords (D- AZ).
"We are not aware of any confidential patient information being released publicly," the hospital said in a statement.
Mayo Clinic fired an employee who worked in a business center in Arizona for accessing nearly 2,000 patient medical and financial records over a four-year period, the Post-Bulletin of Rochester, MN, reported in September. The employee's access rights covered all Mayo Clinic patient records at all Mayo sites.
Officials discovered the breach in mid-July. They did not release the name of the healthcare worker.
"This activity took place between 2006 and 2010. An internal investigation was immediately launched. Following a thorough review of the facts, the person was fired," according to a Mayo statement.