After Boston, how can open events be secure?

Updated
Flowers are seen at the barricaded entrance at Boylston Street near the finish line of the Boston Marathon in Boston, Massachusetts April 16, 2013. Two bombs...
Flowers are seen at the barricaded entrance at Boylston Street near the finish line of the Boston Marathon in Boston, Massachusetts April 16, 2013. Two bombs...
UNITED STATES - Tags: SPORT ATHLETICS CIVIL UNREST

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Alex Witt discusses the security implications on future mass gatherings with risk management and security expert Kiersten Todt Coon. She explains the differences between securing open events and closed events.

After Boston, how can open events be secure?

Updated