Four employees at Atascadero State Hospital were attacked Friday, the hospital confirmed Tuesday.
The attacks by patients occurred in three separate incidents on Friday, ASH spokesman Craig Dacus said.
A psychiatric technician was assaulted in one incident, a registered nurse was assaulted in another incident, and both a psychiatric technician and a registered nurse were assaulted in a third incident.
The patient suspected in the third incident, 55-year-old Michael Anthony Richard, was arrested Friday on suspicion of felony assault with a deadly weapon. He was booked into San Luis Obispo County Jail, where he remained Tuesday afternoon on an active hold, according to jail records.
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The employees, whose names and injuries were not disclosed, were treated in the hospital's medical area.
Investigations into the three incidents are ongoing, Dacus said.