BRUSSELS — Belgium apologized on Thursday for the kidnapping, segregation, deportation and forced adoption of thousands of children born to mixed-race couples during its colonial rule of Burundi, Congo and Rwanda.

The apology is the first time that Belgium has recognized any responsibility for what historians say was the immense harm the country inflicted on the Central African nations, which it colonized for eight decades. Prime Minister Charles Michel offered the apology on Thursday afternoon in front of a plenary session of Parliament, which was attended by dozens of people of mixed race in the visitors gallery.

“Throughout Belgian colonial Africa, a system of targeted segregation of métis and their families was maintained by the Belgian state and acts were committed that violated the fundamental rights of peoples,” he said, using the term for mixed-race people.

“This is why, in the name of the federal government, I recognize the targeted segregation of which métis people were victims” under Belgian colonial rule in Africa, and “the ensuing policy of forced kidnapping” after independence, he added.