Nicola Sturgeon’s husband, Peter Murrell, has been arrested in connection with an investigation into the funding and finances of the Scottish National Party (SNP).
The former SNP chief executive is in custody and is being questioned by detectives.
Police Scotland said a 58-year-old man was arrested as part of an ongoing investigation.
Officers are also carrying out searches at a number of addresses, the force added.
A blue evidence tent has been set up outside the couple’s Glasgow home – while officers have also been seen at the SNP’s headquarters in Edinburgh.
Police Scotland has been investigating the spending of about £600,000 which was earmarked for Scottish independence campaigning.