Pedestrians use cell phones as they walk past Twitter Inc. headquarters in San Francisco, California, USA

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Twitter has announced that it will immediately close its offices in San Francisco and New York as Covid cases increase across the country.

Wednesday’s announcement comes just two weeks after the social media company reopened its offices in both cities.

“After carefully reviewing the CDC’s updated guidelines, and given current conditions, Twitter has decided to close our New York and San Francisco offices and to suspend future office openings with immediate effect,” a Twitter spokesman said in a statement Wednesday.

The company added that it continues to closely monitor local conditions and make necessary changes that “prioritize the health and safety of our Tweeps”.

Twitter is the newest company in the Bay Area to either delay its reopening or to close its offices due to the Delta variant.

On Wednesday, Google announced that it would postpone the return of the offices until October. One month later than the original September date.

This story evolves. Stay with NBC Bay Area for updates.