Quite unusual : today at 2:10 PM, 2:15 PM and 2:25 PM, a single MB-339 wearing tail number "1", overflew three times Brussels downtown at low level with white smoke (the second pass was at exceptionnaly low level and the jet made a hard turn to the left over "European area").
I was able to make pictures (poor quality) and it seems like it was an AMI Frecce Tricolori jet ; I guess its presence here was linked to KB aishow. It is not common at all to watch such planes, flying that low over Brussels as the city is a restricted area (exception : National Day...).