The Islamic riots in France have spread to Belgium, and Brussels looks like a war zone right now. This is the capital of the European Union. 88% of people under 18 have a foreign background, and more than half are Muslim. What has Europe done to itself? https://t.co/gVDGj9DKPf
Overall validity: Unknown
Without any citable source, a percentage cannot be defensibly assigned.
Overall validity: Unknown
Reasoning:
Overall validity: 95%
Overall validity: Unknown
Based on my investigation, I could not find sufficient evidence to verify or refute this specific claim.
Reasoning:
Because there is no source giving the Muslim share specifically among Brussels residents under 18, and no dataset tracks religion by age for the region, I cannot state a defensible percentage for this claim. While the overall Muslim-origin share (~17% in the commonly accepted 2016 estimate) makes the claim look implausible, that alone is not enough to assign a verified percentage to the under-18 figure.
Overall validity: Unknown