Marathons face security challenges
How to secure a major road race with crowds stretching 26.2 miles?
At 2:50 p.m. ET Monday, two explosions blasted the crowd near the finish line of the Boston Marathon. The bombings killed three people and injured at least 176 others -- revealing what marathon organizers around the world have feared but hoped they would never have to admit: Their events are among the most vulnerable in sports to terrorist attack.
By 2:51 p.m., emergency response was underway, tracking down and re-routing all remaining runners, moving the wounded to triage, cordoning ...
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