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The self-proclaimed racist who attacked a New Zealand mosque during Friday prayers in an assault that killed 49 people used rifles covered in white-supremacist graffiti and listened to a song glorifying a Bosnian Serb war criminal.

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These details highlight the toxic beliefs behind an unprecedented, live-streamed massacre, which Prime Minister Jacinda Ardern called “one of New Zealand’s darkest days.”

Some of the material posted by the killer resembles the meme-heavy hate speech prominent in dark corners of the internet. Beneath the online tropes lies a man who matter-of-factly wrote that he was preparing to conduct a horrific attack.

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MUSIC

— The shooter’s soundtrack as he drove to the mosque included an upbeat-sounding tune that belies its roots in a destructive European nationalist and religious conflict. The nationalist Serb song from the 1992-95 war that tore apart Yugoslavia glorifies Serbian fighters and Bosnian Serb political leader Radovan Karadzic, who is jailed at the United Nations war crimes tribunal in The Hague for genocide and other war crimes against Bosnian Muslims. A YouTube video for the song shows emaciated Muslim prisoners in Serb-run camps during the war. “Beware Ustashas and Turks,” says the song, using wartime, derogatory terms for Bosnian Croats and Muslims.

— When the gunman returned to his car after the shooting, the song Fire by English rock band The Crazy World of Arthur Brown can be heard blasting from the speakers. The singer bellows, “I am the god of hellfire!” as the man, a 28-year-old Australian, drives away.