Passengers evacuating train in Belgian metro tunnel
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Explosion at Brussels metro during terrorist attack

22 March 2016 Last updated at 14:12 GMT

At least 31 people have been killed and many seriously injured in attacks at Brussels international airport and a city metro station.

The first attack occurred at Zaventem airport at 07:00 GMT, with twin blasts tearing through the departures area.

Another explosion struck Maelbeek metro station an hour later, as Christian Fraser reports.