Nicola Sturgeon has been arrested in the police investigation into the SNP's finances.
Police Scotland said she is in custody and is being questioned by detectives.
A police spokesperson said: "A 52-year-old woman has today, Sunday, June 11, been arrested as a suspect in connection with the ongoing investigation into the funding and finances of the Scottish National Party."
A spokesperson for Nicola Sturgeon, said: "Nicola Sturgeon has today, Sunday 11th June, by arrangement with Police Scotland, attended an interview where she was to be arrested and questioned in relation to Operation Branchform.
"Nicola has consistently said she would co-operate with the investigation if asked and continues to do so."
Peter Murrell, the former SNP Chief Executive and Nicola Sturgeon’s husband was arrested in April.
Colin Beattie, who was SNP treasurer at the time, was also arrested and both were released without charge pending further inquiry.
Police searched Mr Murrell’s home, that he shares with Nicola Sturgeon over a number of days and other properties including SNP HQ in Edinburgh.
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