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Boris Johnson to campaign to leave EU Boris Johnson to campaign to leave EU
(35 minutes later)
Mayor of London Boris Johnson is to campaign to leave the EU in the UK's referendum, BBC understands Conservative Mayor of London Boris Johnson is to campaign for Britain to leave the EU, the BBC understands.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. The MP's decision comes as ministers began campaigning over the UK's EU membership, after PM David Cameron called a referendum for 23 June.
If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts. He is expected to confirm his decision on Sunday evening and give his reasons for it in his column for the Telegraph newspaper.
Mr Cameron told the BBC leaving the EU would be "a leap in the dark".
Live: Ministers clash over EU referendum campaign
The UK's EU vote: All you need to know
BBC Political Editor Laura Kuenssberg said Mr Johnson's decision will be seen as a huge boost to the Out campaign and a major blow to the prime minister who had hoped to persuade friends and rivals to back the campaign to remain.
Mr Johnson, who was elected to Parliament in May 2015 as the MP for Uxbridge and Ruislip South, joins six other ministers who attend cabinet in backing the campaign to leave.
Zac Goldsmith, who is hoping to become Mr Johnson's successor as London mayor in May, has also said he will vote to leave.
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