By CBS3 Staff

TRENTON, N.J. (CBS) — Multiple sources have told Eyewitness News that New Jersey Gov. Phil Murphy will announce universal masking for all students in grades K-12 for the start of the upcoming school year.

Murphy had said on multiple occasions that masks requirements would be left up to local districts, however, the sharp rise in COVID cases across the state fueled by the delta variant has forced the governor and state to reconsider that decision.

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The governor is scheduled to make this “major public health announcement” at an elementary school in Middlesex County on Friday at 1:15 p.m. We will stream this announcement live on CBSN Philly.

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New Jersey on Thursday recorded its highest single-day number with 1,300 daily COVID cases. It’s a 367% increase from a month ago. Burlington and Cumberland Counties have now joined Cape May County as hot spots.

On Wednesday, a fiery Murphy confronted anti-vaccine protesters at an event in North Jersey.

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“These folks back there have lost their minds, you’ve lost your minds. You are the ultimate knuckleheads and because of what you are saying and standing for people are losing their life. People are losing their life and you have to know that. Look in the mirror,” Murphy told the protesters.