At the margins of the controversy surrounding the remarks of Jan Jambon, a Brussels police officer reported he had witnessed to a Dutch-speaking channel, indicating that he had indeed seen Muslims glorifying the Brussels attacks of 22 March. From there to describing the events as "street celebrations"? He didn't go that far.
When the information concerning the number of victims started to come out, a police officer - who prefers to remain anonymous - witnessed several incidents. According to him, a certain number of Muslims clearly rejoiced at the attacks. "I witnessed three incidents, involving nine people. We saw "jeunes" [young people] laugh, make the V sign (for Victory) and lift the index finger to the sky (note: a sign that has become a symbol of allegiance to Islamic State). I also was present at a scene where a man said: "'Finally! It was time you were punished'", he recalled to the Flemish channel vtm, which was hosting the Minister of the Interior Jan Jambon.Source