Kenzo Tribouillard, AFP | People hold a banner reading 'Je suis Bruxelles' (I am Brussels) in tribute to victims of the March 22, 2016 attack in Paris

Belgium was in mourning Tuesday after a series of explosions struck Brussels's Zaventem airport and a city metro station earlier in the day, killing 31 people and wounding more than 200. To see how the day's events unfolded, read our live blog.

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Two explosions tore through the departure hall at Brussels Zaventem airport, killing 11 people.

About an hour after the airport attack, an explosion struck Maelbeek metro station near the EU headquarters, killing at least 20 people.

The Islamic State group has claimed responsibility for the attacks.

Belgian Prime Minister Charles Michel has condemned the “blind, violent and cowardly acts”, calling it a “black day” for the country.

The Belgian government has raised the terror threat to the highest level.

Brussels is in a state of lockdown with all transportation services, including metros, trains and bus services suspended. Zaventem airport has been shut down and flights have been diverted.

The blasts come days after Paris attacks suspect Salah Abdeslam was arrested in the Molenbeek district of the Belgian capital.

To see how the day's events unfolded, read our liveblog below.

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