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also warning of a strong likelihood of new variants which could be more dangerous and more difficult to control. we're going to go now to cnn stephanie elam in los angeles county where officials are bringing back mask man date even for those fully vaccinated. what led to this decision? >> the numbers. it's easy when you look at the data. it's really clear what is happening here. since the state reopened on june 15th, l.a. county said they have seen a 700%700% increase in num of cases coming through. june 15th it was half a percent. yesterday it was 3.7%. they are saying numbers are showing us that everything is going in the wrong direction. there's been 1,000 plus new cases every day for the last century days. that is why they are saying beginning tomorrow night, masks