As breakthrough cases climb, Murphy administration is again telling residents to mask up indoors in crowded circumstances. With the delta variant driving the increased spread of coronavirus and a rise in diagnoses and hospitalizations, New Jersey officials are urging residents — regardless of vaccination status — to once again don masks in potentially risky indoor settings. “Our metrics are trending in the wrong direction, and new data suggests the Delta variant is more transmissible even among vaccinated individuals, which is why we are making this strong recommendation,” Gov. Phil Murphy and New Jersey Department of Health Commissioner Judy Persichilli said Wednesday in a joint statement.