Debunked AI-altered images are being used online as “evidence” of political beliefs tied to a Polish attacker after a shooting in Kraków that left six people dead. The claims centre on an online collage widely shared since the night of the attack. The images were promoted alongside false statements that the gunman was linked to far-left beliefs. Kraków prosecutors said the suspect was obsessed with a mass murder by a white supremacist in Norway. Police later reported that the investigation had yet to determine the motive. On 7 October, the suspect allegedly killed his parents and sister before travelling to Kraków. He then opened fire at passing people in the main square, killing six and wounding 16 others. The attacker was shot by police and died in hospital. The debunked collage being shared online included five images, with three said to be screenshots from the attacker’s Facebook profile and another showing his face. Two of the screenshots appeared to be more than five years old, while at least two images were altered using AI. The collage also included an image featuring Pope John Paul II, with the pope’s head cut off by the border, and a separate blurry image of a person wearing a gas mask and a red beret associated with sections of the Polish army, holding a rainbow flag. Both images showed signs of being posted at least five years earlier. Investigators also flagged AI “sharpening” claims. The altered images reportedly contained a SynthID, an invisible digital watermark added by some AI image generators. The reconstruction, however, could not have revealed new details from the original blurry footage, and instead risked inventing information. Polish justice officials said prosecutors found an online history of searches for Anders Breivik, the Norwegian white supremacist who killed 77 people. Police have not published a confirmed motive, and the probe remains ongoing.