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Facebook has been notifying users on Friday that they were dead, according to widespread reports across social media.

Many people have reported seeing a banner on certain profiles that reads: “We hope people who love [Mark] will find comfort in the things others share to remember and celebrate his life.”

Not all profiles were affected. But at one point, even Facebook CEO Mark Zuckerberg was declared dead by his own social network.

It’s unclear what’s causing the mass obituaries, but it’s likely a bug in Facebook’s system. The company did not immediately return a request for comment.