MADRID--Spanish police requested documents from Banco Santander SA as part of a judicial investigation into once-secret data dispersed by a former employee of HSBC Holdings PLC.

Police sought the documents at Santander's headquarters in the town of Boadilla del Monte, about half an hour outside of Madrid, at the request of a National Court judge.

The judge is investigating data about HSBC clients dispersed by Hervé Falciani, a former employee at the Swiss branch of the bank. Mr. Falciani was handed a five-year prison sentence in a federal criminal court in Switzerland last November.

At the request of National Court Judge José de la Mata, the Spanish police asked Santander to provide documentation "in connection with certain checking accounts" that the court is requesting information about "as part of the investigation of the so-called Falciani list," a spokesman for the National Court said by telephone.

He declined to provide additional details about the judge's investigation.

A spokeswoman for Santander declined to comment.

Two spokespeople for the Spanish police confirmed agents had been at Santander's headquarters on Friday morning, but declined to provide details on how many were at Boadilla del Monte or how many documents they were looking for.

Write to Jeannette Neumann at jeannette.neumann@wsj.com

(END) Dow Jones Newswires

June 03, 2016 07:15 ET (11:15 GMT)

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