Greek police have asked for permission to check the phone records of Golden Dawn politicians as part of an investigation into the killing of a anti-racism rapper by a supporter of the far-right party, police said.
The government has already asked judges to investigate links between the party, which won 7% of the vote in the last election, and the death of Pavlos Fissas, who was stabbed to death on Tuesday night, after being ambushed a crowd of 30.
A police officer told Reuters that they want to establish if Golden Dawn politicians or local party chiefs called supporters on the evening of the death.
The government says it believed the party is a criminal organisation and a threat to public safety.
More top news
A second police officer has died after he and a colleague were shot as they scuffled with a suspect in Florida.
Thousands of demonstrators have marched through Boston in opposition to a right-wing rally in the city which was eventually cut short.
Some 1,000 counter-protesters blocked 500 neo-Nazi demonstrators as they tried to march to the site of the death of Hitler ally Rudolf Hess.