Mohamed Abrini, who was already indicted over the Paris attacks, has been charged with "terrorist murders" in connection with last month's carnage in Brussels, Belgium's federal prosecutor said on Sunday.

"The investigating judge specialised in terrorism cases has put Mohamed Abrini in detention in connection with the investigation into the Brussels and Zaventem (airport) attacks," a statement said.

"He is charged with participation in the activities of a terrorist group, terrorist murders and attempts to commit terrorist murders."

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