Elon Musk has warned of demographic replacement in the Belgian capital, citing a recent study that found that nearly three out of four minors in Brussels are of non-European origin.

Approximately 72.9% of Brussels residents aged 0-17 are believed to have an immigrant background, Remix News reported earlier this week, citing data from StatBel, Belgium’s official statistics office. According to the report, only 10.56% in this age group are classified as Belgians of exclusively Belgian origin. Overall, 78% of the city’s population is now said to be of non-Belgian origin.