A spokesman for Poland’s security services chief said the two were detained on Sunday by the Internal Security Agency (ABW) after a probe into an extremist group which modelled its plans on terror attacks carried out by Anders Breivik in 2011 in Norway, and by Brenton Tarrant this year in New Zealand.
Breivik, an anti-Muslim neo-Nazi, killed 77 people in Norway’s worst peacetime atrocity.
Tarrant is accused of killing 51 people in a terrorist attack on two mosques in New Zealand.
Stanisław Żaryn, spokesman for Poland’s security services chief, said that during a search of a home in the Warsaw district of Włochy, officers seized substances which could be used to produce large quantities of explosives, along with firearms and ammunition.
Investigators also found eight vials with “highly toxic chemicals,” state news agency PAP reported.
The detained pair have been charged with planning to detonate explosives, publicly calling for the murder of ethnic and religious groups, and possession of unauthorised materials and firearms.
Polish authorities said last week they had expelled a Swedish neo-Nazi who arrived in the country for paramilitary training.