The one who massacred eight people in Serbia was a neo-nazi who was wearing a a t-shirt with neo-Nazi symbols as he was slaughtering people. As we read in WION:

Authorities in Serbia released more details about the shooter who killed eight people in the country’s second mass shooting in two consecutive days, on Friday (May 5). The young man was wearing a t-shirt with neo-Nazi symbols and was later caught hiding at his grandfather’s house.

The incident took place in the Siberian town of Mladenovac’s Dubona village, late Thursday, where the police after an hours-long manhunt arrested the gunman suspected of carrying out the attack. The attack also resulted in the wounding of at least 14 others in the village not too far from Belgrade.