Police Scotland said a 52-year-old woman was detained Sunday morning "as a suspect in connection with the ongoing investigation into the funding and finances of the Scottish National Party."
Two former SNP officials, Colin Beattie, who was treasurer, and Peter Murrell, who was chief executive, were previously arrested and questioned as part of the investigation. Like Sturgeon, both were released pending further inquiries. The first female leader of Scotland's devolved government, Sturgeon led her party to dominance in Scottish politics and refashioned the SNP from a largely one-issue party into a dominant governing force with liberal social positions.
Scottish voters backed remaining in the U.K. in a 2014 referendum that was billed as a once-in-a-generation decision. The party wants a new vote, but the U.K. Supreme Court has ruled that Scotland can't hold one without London's consent. The central government has refused to authorize another referendum.