Los Angeles County will reimpose its mask mandate this weekend in the latest sign that public health officials are struggling with an alarming rise in coronavirus cases tied to the highly contagious Delta variant. The county, home to 10 million people and the nation's second-largest city, Los Angeles, is one of several jurisdictions to recommend or mandate wearing masks or other pandemic restrictions in recent days as cases rise to worrisome levels in many parts of the United States. "We’re requiring masking for everyone while indoors at public settings & businesses, regardless of vaccination status so that we can stop the increased level of transmission we're seeing," the Los Angeles County Department of Public Health said on Twitter Thursday.