I posted about this incident before but this video has more detail in it.
Police officers did their best to separate the two groups and prevent further fighting. At one point the rioters hurled street paving stones at the police that responded with tear gas. Calm returned around 1:30 AM.Source: Flanders News
The rioting has caused considerable material damage. Shop windows were shattered, cars were trashed and bus shelters damaged. A number of people had to be taken to hospital for treatment, but all have now been discharged. The police also report one stabbing in which one person was injured, but the exact circumstances have not yet been established.
See earlier post about same incident here.