The shooter in Krakow killed his parents and sister before attacking.
New details have emerged about the mass shooting in Poland:
The bodies of Michal O's mother, father and sister, 25 years old, were found in his apartment. He allegedly killed them before the attack.
The man had not previously come to the attention of the police and was in possession of an official weapon permit.
According to the head of the Polish Interior Ministry, the attacker acted alone and was interested in far-right ideologies.
The shooter's neighbor said his behavior had been concerning for a long time: he often wore a mask and a hood.
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