New York (CNN Business) Facebook (FB) is canceling all of its planned physical events with 50 or more people through June 2021 due to concerns about the coronavirus pandemic.

Some of those events will be held virtually instead, wrote CEO Mark Zuckerberg in a post on his Facebook page on Thursday.

Zuckerberg also said the "vast majority" of Facebook employees will work from home through at least the end of next month. The company is extending its policy of no business travel through at least June.

"A small percent of our critical employees who can't work remotely, like content reviewers working on counter-terrorism or suicide and self-harm prevention, and engineers working on complex hardware, may be able to return sooner, but overall, we don't expect to have everyone back in our offices for some time," Zuckerberg said.

Covid-19 has infected more than 2 million people and killed at least 137,000 worldwide, according to Johns Hopkins University.

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