It is the first time since 1974 that sitting members of Parliament have been arrested. The arrests underline the Greek government's efforts to stifle the fiercely anti-immigrant party, which has been increasingly on the defensive since the killing.
Police announced the arrests of 16 Golden Dawn members on charges of forming a criminal organization, including party head Nikos Michaloliakos, the group's spokesman and three other lawmakers.
An operation by the counterterrorism unit was still ongoing late Saturday morning, with a total of about 35 arrest warrants for Golden Dawn members issued, two police officials said. They spoke on condition of anonymity because they were not permitted to speak publicly.
The government ordered an investigation into Golden Dawn's activities after the death of rapper Pavlos Fyssas on Sept. 18 sparked outrage across Greece. The suspect arrested over his death admitted to police that he had stabbed the 34-year-old and identified himself as a supporter of Golden Dawn.
Investigations have extended to the police, which have been accused in the past of turning a blind eye to Golden Dawn violence and of mistreating immigrants. A police officer was also arrested on Saturday.
The case is being handled by Greece's Supreme Court and anti-terrorist squad under organized crime laws.
Despite the arrests, the party's lawmakers retain their parliamentary seats unless they are convicted of a crime. Golden Dawn holds 18 of Parliament's 300 seats, after winning nearly 7 percent of the vote in general elections last year.
The party has vehemently denied any role in the killing, but the killing has appeared to dent its appeal among Greeks. As calls for a crackdown mounted, the party hinted its deputies might resign to provoke elections.
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Golden Dawn expressed outrage at the arrests in a text message to journalists. "We call upon everyone to support our moral and just struggle against the corrupt system! Everyone come to our offices!," it said.
A later text message called for supporters to head to police headquarters "with calm and order." A group of about 100 people, including several deputies, gathered, standing on the sidewalk across the street from the building.
A formerly marginal organization with neo-Nazi roots, Golden Dawn entered Parliament for the first time in May 2012, capitalizing on Greece's deep financial crisis, rising crime and anti-immigrant sentiment.
The party's members and supporters have frequently been suspected of carrying out violent attacks, mainly against immigrants. Despite its reputation for violence, the party had enjoyed growing popularity.
A government spokesman refused to comment on the details of the operation.
"Democracy can protect itself. Justice will do its job," Simos Kedikoglou told reporters.
Press; By DEMETRIS NELLAS]
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