Two more MPs from Greece's extreme right Golden Dawn party have been jailed on charges of playing a pivotal role in a criminal organisation.
A third politician facing similar accusations will testify to prosecutors today.
Giorgos Germenis and Panagiotis Iliopoulos testified for several hours to two appeals court prosecutors.
Yermenis, also known as Kaiadas from his stint as a bassist with Greek-Norwegian black metal band Naer Mataron, has been accused by witnesses of training Golden Dawn members to attack migrants.
Another politician, Efstathios Boukouras, will testify this morning. Apart from membership in Golden Dawn, he faces charges of extortion.
Greek far-right group Golden Dawn has blamed the country's government after two of its members were shot dead, saying it had asked for police protection at its offices after receiving threats.
"(Prime Minister Antonis) Samaras's anti-Greek government is to blame for the crime, which allowed out-of-control terrorists to murder young kids in cold blood," the party said in a statement.
No one has claimed responsibility for the attack, although a police official told Reuters the force suspected unnamed anti-establishment groups.
Greek far-right group Golden Dawn said on its website that two of its members, aged 20 and 23 years old, were killed in today's shooting in Athens.
However, police have not yet verified the identities of the victims.
The Greek authorities said the gunmen who shot dead two members of the far-right Golden Dawn group today will be "dealt with unsparingly".
Government spokesman Simos Kedikoglou told reporters:
The murderers - whoever they are - will be dealt with unsparingly by our democracy. Let everyone know this.
Police sources have said at least two people were killed in a drive-by shooting outside the offices of Greece's far-right Golden Dawn party in Athens.
A member of the Greek far-right group Golden Dawn has been killed in a drive-by shooting, ITV News sources have said.
Two other Golden Dawn members were reportedly critically injured in the attack, which took place outside the organisation's offices in Heraklion, Athens.
The leader of Greece's far-right Golden Dawn party has been remanded in custody on charges of running a criminal group.
Nikolaos Mihaloliakos appeared before a magistrates court and a prosecutor to respond to charges of founding and participating in a criminal organisation.
The decision to jail the party chief will be a boost for Prime Minister Antonis Samaras' efforts to clamp down on Golden Dawn after an alleged party sympathiser fatally stabbed an anti-fascism rapper last month.
Mihaloliakos was arrested on Saturday alongside other party members.
Three senior members of Greece's far-right Golden Dawn party barged their way from court after being freed following charges of belonging to a criminal group.
The party's spokesman Ilias Kasidiaris was released on bail of 50,000 euros and has been prevented from leaving the country. Ilias Panagiotaros and Nikos Michos were released with travel restrictions while a fourth member, Yannis Lagos, was sent to jail pending trial.
All four denied charges against them in a plea session before an investigating magistrate that lasted more than 18 hours.
The four men were arrested on Saturday along with party leader Nikolaos Mihaloliakos and other party members.
Three senior politicians from Greece's far-right Golden Dawn party have been released pending their trial on charges of belonging to a criminal group.
Court officials told the Associated Press a fourth politician, Ioannis Lagos, was jailed ahead of the trial.
The Golden Dawn party members were arrested at the weekend following an investigation into the fatal stabbing of 34-year-old Greek hip-hop artist and anti-racism campaigner Pavlos Fyssas.
All four denied charges against them in a marathon plea session before an investigating magistrate that ended early this morning after more than 18 hours.
The leader of Greece's far-right Golden Dawn party will appear in court today where he is expected to respond to charges of organising a criminal group.
Nikolaos Mihaloliakos was one of six party members arrested over the weekend.
The arrests came amid public anger over the fatal stabbing of anti-fascist rapper Pavlos Fyssas.
The man arrested over the attack told police he was a supporter of the far-right party, though Golden Dawn deny any link.