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A picture taken on March 22, 2016 in Zaventem, shows the damaged facade of Brussels airport after at least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport.AFP PHOTO / JOHN THYS / AFP / JOHN THYS        (Photo credit should read JOHN THYS/AFP/Getty Images)
A picture taken on March 22, 2016 in Zaventem, shows the damaged facade of Brussels airport after at least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport.AFP PHOTO / JOHN THYS / AFP / JOHN THYS        (Photo credit should read JOHN THYS/AFP/Getty Images)

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    How authorities will investigate Belgian blasts

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How authorities will investigate Belgian blasts

CNN counter terrorism analyst Philip Mudd explains how the Belgian officials will begin to investigate the multiple explosions that rocked the city.

How authorities will investigate Belgian blasts

CNN counter terrorism analyst Philip Mudd explains how the Belgian officials will begin to investigate the multiple explosions that rocked the city.