Dutch authorities say police officials in Spain have arrested a man believed to be connected to an online attack on a spam-fighting site that snarled the Internet last month.
While the authorities did not give the full name of the man in a statement published on a Dutch government Web site, they identified him as “S.K.” A source close to the investigation, who was not authorized to speak publicly, confirmed that the arrested man was Sven Olaf Kamphuis, a 35-year-old Dutch man who has been the spokesman of a group that was protesting a European antispam group’s tactics.