Six former Northern California nursing home employees are under arrest on charges they covered several elderly patients with cream to make them slippery as part of a prank against their co-workers.

California Attorney General Jerry Brown announced the arrests Tuesday, calling the alleged abuse "despicable behavior."

All of the patients at Valley View Skilled Nursing Facility in Ukiah suffered from dementia, Brown said, and were unable to object to their treatment.

The six employees have been fired. They face one misdemeanor count each of injury to elder or dependent adult; battery committed on elder or a dependent adult; conspiracy; and battery committed while on hospital property.

Bail has been set for $7,500 each.