Officials with the California Department of Social Services (CDSS) visited all three locations of Aspen Leaf Preschool in January after receiving a complaint that the school was not enforcing the state's mask mandate, according to the CDSS' response to a complaint by the preschool's owner, Howard Wu.

According to the CDSS letter, which Wu shared with Fox News Digital, officials with the agency's Community Care Licensing Division entered the three preschool locations on Jan. 19, separated the children from their teachers and interviewed them privately about their masking practices.

In his complaint to the agency, Wu described the investigation as a "simultaneous, multi-school raid" that resulted in "unnecessary and inappropriate child interviews."