More than 30 people have been killed and dozens more injured in explosions at Brussels airport and a metro station.
Twin blasts struck the main terminal of Zaventem international airport, in the north-east of the city.
Another explosion hit the Maelbeek metro station in the city centre, close to several European Union institutions.
The so-called Islamic State group has said it was behind the attacks.
They come four days after the capture in Brussels of Salah Abdeslam, the main suspect in the jihadist attacks in Paris on 13 November 2015.