An Athens court has ordered the head of Greece's extremist right-wing Golden Dawn party to be jailed pending trial on charges of running a criminal organization. The order is part of an investigation into his party triggered by the killing of a left-wing rapper.

Nikos Michaloliakos, who is a sitting member of Parliament, was ordered remanded in custody early Thursday, after overnight testimony that lasted for more than six hours.

On Wednesday, the court ordered the release of three party lawmakers and the jailing of a fourth in the same case. All have denied the charges against them.

Michaloliakos and five of his party lawmakers were among 20 people arrested over the weekend in a crackdown against the Nazi-inspired party following the Sept. 17 fatal stabbing of singer Pavlos Fyssas.