Chalk Drawings of Hope, Solidarity Fill Brussels Square

abc News reports,Belgians and tourists gathered in the plaza outside the Bourse –- the Belgian stock exchange –- to pay tribute to the killed and dozens more injured at the Brussels airport and metro station.

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At least 30 people have been killed by two bombs that exploded in the check-in area of the Brussels airport and one bomb that exploded in a transit station in the city center.

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ISIS has claimed responsibility for the bombings.Authorities have sought the public's assistance in identifying a man in a surveillance photo taken just before the explosions at the airport. The other two men in the photo may have set off the airport explosions in suicide attacks.