The EU flags fly at half-mast outside the European Commission headquarters to pay tribute to the victims of the attacks in France and Austria, in Brussels, Belgium, Nov. 3, 2020. (Photos: Xinhua)

The EU flags fly at half-mast outside the European Commission headquarters to pay tribute to the victims of the attacks in France and Austria, in Brussels, Belgium, Nov. 3, 2020.

The EU flags fly at half-mast outside the European Commission headquarters to pay tribute to the victims of the attacks in France and Austria, in Brussels, Belgium, Nov. 3, 2020.

The EU flags fly at half-mast outside the European Commission headquarters to pay tribute to the victims of the attacks in France and Austria, in Brussels, Belgium, Nov. 3, 2020.

The EU flags fly at half-mast outside the European Commission headquarters to pay tribute to the victims of the attacks in France and Austria, in Brussels, Belgium, Nov. 3, 2020.

The EU flags fly at half-mast outside the European Commission headquarters to pay tribute to the victims of the attacks in France and Austria, in Brussels, Belgium, Nov. 3, 2020.