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Local police called for the Federal police to step in after violence escalated rapidly and young people attacked officers with rocks and knives.

Local news site RTL said: "Crowd movement in the Place de la Monnaie in Brussels, traffic had to stop because people were running through, at least 200 to 300 people seemed to want to run away from each other. Police sirens have been heard continuously since ".

An angry crowd of hundreds gathered in Place de la Monnaie in the city after a Youtube star called his fans to meet in the area for a music video.

Rapper ‘Vargasss 92’ asked his fans to meet him at the square at 4pm.