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Earlier Tuesday, Paris Mayor Anne Hidalgo said the French landmark would be illuminated in black, yellow and red.

The Eiffel Tower Twitter account also sent out a message.

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"In solidarity and in homage to the Belgian people, (the tower) will illuminate in the Belgian colors," the message translates.

The Eiffel Tower was lit up in the colors of the French flag after the terror attacks in Paris last November. The town hall of Brussels also lit up with the French colors at the Brussels Grand Palace after those attacks.

>>Brussels attack: 5 things to know

Belgium shares France's northeastern border.

At least 30 people were killed in the attacks in Brussels and several dozen were injured.