Two explosions have struck the departures area of Zaventem airport in BrusselsThe Belgian government has confirmed there are casualties but has given no numbers yet.The cause of the explosions is unknown. The airport is being evacuated and has been closed to flights.The blasts come four days after the capture in Brussels of Salah Abdeslam, the main suspect in the jihadist attacks in Paris on 13 November 2015. Belgium has now raised its terror threat to its highest level. Over 30 people have been reported killed so far.