According to police, Nicola Sturgeon, a former leader of Scotland, was arrested on Sunday as part of an inquiry into financial irregularities.

Her arrest is the third in the investigation, which has shocked Scotland’s political establishment, which has long been dominated by the Scottish National Party (SNP).

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A spokesperson for Sturgeon said the former SNP leader voluntarily attended an interview with police.

She was in custody and was being questioned by detectives, added police.

Sturgeon’s husband Peter Murrell, the former chief executive of the SNP, was arrested in April as part of the probe.

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Peter Murrell, husband of former First Minister Nicola Sturgeon, was arrested by Scottish police in an investigation into the Scottish National Party’s fundraising finances. Murrell, 58, resigned as the chief executive of the Scottish National Party on 17 March, shortly after Nicola Sturgeon announced that she would be resigning as First Minister of Scotland on 15 February.

Murrell, who formerly served as the Scottish National Party’s chief executive, was born in Edinburgh in 1964 and attended Craigmount High School there. Before ascending through the ranks of the SNP, he attended the University of Glasgow to further his education. Prior to succeeding Michael Russell as the leader of the Scottish National Party in 1999, he had previously worked for Alex Salmond. He received some credit for the party’s electoral win in 2007.

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In 1988, Nicola Sturgeon, who was five years Murrell’s junior, visited an SNP youth camp that Murrell had organized. They started dating in 2003, and in 2010 they got married in Glasgow’s Rath Mór, a former church that has been transformed into a bar and restaurant.

Together, the two have been spotted at party conventions, outside polling places, and at official occasions like the Queen’s Jubilee celebration. They are not parents, but Nicola Sturgeon has talked openly about her anguish over a miscarriage she had at age 40. No matter how badly we might want it, having a kid just doesn’t happen sometimes, she remarked prior to the 2011 Scottish parliamentary election campaign.