Belgian authorities on Saturday charged three men with "attempted terrorist murder" after raiding dozens of homes in raids linked to a reported threat to fans during a Euro 2016 game.

Named by prosecutors as Samir C., Moustapha B. et Jawad B., the trio were among 12 people detained during the overnight raids, hours before thousands of people gathered around screens to watch Belgium play Ireland.

The three have also been charged with "participation in the activities of a terrorist group", while the nine others were released after questioning, prosecutors added.