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Greek police have arrested the leader of the far-right Golden Dawn party, Nikolaos Mihaloliakos, on charges of forming a criminal organisation.
Another Golden Dawn MP has been held and more warrants issued, police say.
The arrests and warrants come amid anger over the murder on 18 September of anti-racist musician, Pavlos Fyssas.
A man arrested for the stabbing told police he was a supporter of Golden Dawn, though the party strongly denies any link.
"The Secretary General and one lawmaker of the Golden Dawn Party were arrested a short while ago after arrest warrants were issued," Greek police said in a text message.
The other MP arrested was said to be Ilias Kasidiaris.
The BBC's Mark Lowen in Athens says that this is an unprecedented crackdown on a political party.