A 54 year old man, train driver for NMBS, was killed Saturday while traveling on a bus in the center of Antwerp. A group of around 6 young men (about 18-21 year old) were fighting on the bus and when the man tried to intervene they started kicking and assaulting him. The man died of a heart attack on the spot.
The bus, meanwhile, had stopped on the side of the road, and the young men fled through the open doors. They are now wanted for manslaughter.
It is unclear who the attackers were, though there is starting to be talk that they were "allochtonen" (meaning 'immigrants', but usually specifically for Muslims). The Belgian press and politicians are very careful about assigning blame at the moment, specifically since the last time everybody was ready the hang Moroccans for an outrageous murder, the murderers had turned out to be Polish gypsies.
Source: De Standaard (Dutch)