 And as the evacuation was underway, some dogs, undergoing surgery and heavily sedated, were removed and the operations continued at the shelter's evacuation center. The shelter reopened in the afternoon. The Maricopa County Sheriff's Office bomb squad checked for explosives and nothing was reported, but Powell won't discuss any specifics about the kind of threat made. MCSO, that's the Maricopa County Sheriff's Office, is investigating that incident.