Nicola Sturgeon, the ex-first minister of Scotland, was arrested Sunday as part of a law enforcement probe into the finances of the ruling Scottish National Party (SNP), officials said.

Police Scotland, the nation's national police force, confirmed in a statement that a "52-year-old woman...has been arrested as a suspect in connection with the ongoing investigation into the funding and finances of the Scottish National Party." The woman was "in custody and is being questioned by Police Scotland detectives," Police Scotland added.

While officials in the United Kingdom don't name suspects until they are charged, BBC News identified the arrestee as Sturgeon, and her spokesperson later told the outlet that she "attended an interview where she was to be arrested and questioned."

"Nicola has consistently said she would cooperate with the investigation if asked and continues to do so," the spokesperson added.

Sturgeon took over as first minister and leader of the SNP in 2014, and was seen as a dominating force in politics, becoming one of the strongest proponents of Scottish independence from the United Kingdom. However, she shocked the country this past February when she announced her resignation as first minister, saying she knew "in my head and in my heart" that it was time to step down.

Her arrest is part of a probe known as Operation Branchform, an investigation into "allegations that the [SNP] misspent more than £600,000 in donations for an independence campaign," The Guardian reported. Sturgeon's arrest comes a little over two months after her husband, former SNP chief executive Peter Murrell, was also arrested in relation to the probe.

Murrell was interviewed for 12 hours before being released without charge, The Guardian reported. Police also searched Sturgeon and Murrell's home and the SNP headquarters, in addition to arresting the party's treasurer, Colin Beattie, who was also released without charge.

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