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Former First Minister Nicola Sturgeon has been arrested in connection with the ongoing investigation into the funding and finances of the SNP.
Police confirmed a 52-year-old woman was taken into custody as a suspect and is being questioned by detectives.
It follows the arrest and release of her husband, ex-SNP chief executive Peter Murrell in April.
A spokesman for Ms Sturgeon confirmed she was cooperating with the investigation.
He said: "Nicola Sturgeon has today, Sunday 11 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 cooperate with the investigation if asked and continues to do so."
On 5 April, officers searched Ms Sturgeon's home and the party's headquarters in Edinburgh.
Mr Murrell was later released without charge.
A luxury motorhome was also seized by police from outside the home of Mr Murrell's mother in Dunfermline.
Almost two weeks later, SNP treasurer Colin Beattie was arrested and released without charge.
Mr Murrell and Mr Beattie were both treated as suspects and were taken into custody for the legally defined period of up to 12 hours of questioning before being released pending further inquiries.
Under the Criminal Justice (Scotland) Act 2016, police can release a suspect for further investigation, but they can be re-arrested at a later date.
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