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.

“The capital city of Belgium is no longer Belgian,” Musk wrote on X on Friday, responding to a post by entrepreneur Mario Nawfal, who warned that the demographic transformation of Brussels will have “profound social consequences.”

“This did not happen by accident, but through deliberate policy choices made by political elites who dismissed warnings as ‘myths,’” Nawfal wrote, noting that “family reunification has become the primary engine of mass settlement, accelerating demographic change far beyond public consent.”

Belgian MP Filip Dewinter of the Vlaams Belang party has also described the trend in Brussels as “population replacement,” arguing the data supports the assertion that “the native European population is being replaced.”

Similar trends have been noted in other European cities. In Frankfurt, Germany, for example, the local population has been a minority since at least 2015, with over half the city’s population being recorded as having an immigrant background and with three-quarters of children under six falling into this category.

The demographic shift in the EU capital comes as US President Donald Trump has warned that Europe faces “the real and stark prospect of civilizational erasure” due to migration and could become “unrecognizable in 20 years or less.”

Elon Musk had previously criticized mass migration, arguing it “will lead to the destruction of every country that permits it,” and has said leftist politicians are “importing a leftist voting bloc dependent on government subsidies.”