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11 June 2013, 14:58
Ted Dwane from Mumford and Sons is receiving emergency treatment after scans revealed a blood clot on the surface of his brain.
The band confirmed the news in a statement on their website, explaining "our friend and bandmate Ted has been feeling unwell for a few days".
The band reassured fans that "Ted is receiving excellent care and we are being assured that he will recover quickly from surgery."
Mumford and Sons have had to cancel several US shows as a consequence.