Nicola Sturgeon has been arrested as part of a police probe into the SNP finances.
The former First Minister is in custody and is being questioned by detectives, Police Scotland said.
A statement from Police Scotland said: "A 52-year-old woman has today been arrested as a suspect in connection with the ongoing investigation into the funding and finances of the Scottish National Party."
It comes after Ms Sturgeon's husband Peter Murrell was arrested in April.
Mr Murrell and MSP Colin Beattie, who was SNP treasurer at the time, were both released without charge pending further inquiry.
As well as the arrests, searches were carried out at a number of properties, including Mr Murrell and Ms Sturgeon's home - where a police tent was erected in the garden - and SNP headquarters in Edinburgh.
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