Polish Justice Minister Waldemar Zurek issued an update on Tuesday concerning the case of a mass shooting in Krakow over the weekend.
Accused gunman Michal Oksinski was deeply interested in international far-right movements, Zurek said.
"Authorities have accessed the terrorist's computer. It is clear that he visited websites concerning Anders Breivik," the Norwegian neo-Nazi who killed 77 people in July 2011, the minister added.
Zurek said a search of Oksinski's home turned up a Gadsen flag, a banner dating back to the US Civil War that is now associated with American white nationalists.
Police also gathered evidence that he had recently bought 10 magazines for a semi-automatic rifle and 500 bullets.
"It is clear that this individual was preparing to take action," the justice minister said.
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On Friday night, 24-year-old Oksinski is thought to have shot and killed his mother, father, sister and two family cats in the city of Ostrowiec.
The following day at around 3:00 p.m. local time, Oksinski is suspected of opening fire in Krakow's Main Market Square. Six people were killed — four Poles, one Austrian, and one UK national. Another 15 people were wounded.
