(CNN) -- UK Prime Minister Boris Johnson has tested positive for coronavirus, the leader said on Friday.

On his Twitter account, Johnson said he had developed mild symptoms and was self-isolating.

"Over the last 24 hours I have developed mild symptoms and tested positive for coronavirus. I am now self-isolating, but I will continue to lead the government's response via video-conference as we fight this virus. Together we will beat this," Johnson wrote.

This is a breaking story. More to follow.

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