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A picture taken on March 22, 2016 shows a Belgian police vehicle driving past passengers who are evacuating the Brussels Airport of Zaventem.
At least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport on March 22, 2016, Belgian media quoted the federal prosecutor as saying. Officials were not immediately available to confirm the figure when contacted by AFP. The federal police earlier confirmed one death. / AFP / Belga / Jonas Roosens / Belgium OUT        (Photo credit should read JONAS ROOSENS/AFP/Getty Images)
A picture taken on March 22, 2016 shows a Belgian police vehicle driving past passengers who are evacuating the Brussels Airport of Zaventem.
At least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport on March 22, 2016, Belgian media quoted the federal prosecutor as saying. Officials were not immediately available to confirm the figure when contacted by AFP. The federal police earlier confirmed one death. / AFP / Belga / Jonas Roosens / Belgium OUT        (Photo credit should read JONAS ROOSENS/AFP/Getty Images)

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Major European cities are increasing security in the wake of explosions at the Brussels airport and metro station. CNN's Max Foster reports.

People flee from deadly Brussels explosion

Major European cities are increasing security in the wake of explosions at the Brussels airport and metro station. CNN's Max Foster reports.