Nearly 100 residents had to be removed from a nursing home facility in Southern California on Wednesday after a large portion of its staff stopped showing up for work.

The Magnolia Rehabilitation and Nursing Center in Riverside has 39 confirmed cases of coronavirus, according to county officials, and for two days in a row, 13 of its employees were no-shows. It’s unclear why, exactly, they went AWOL, but with a deficit of nursing assistants, 40 ambulances had to move patients to other facilities — a process that took several hours.