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Boston Bombing Shows How Social Media Has Changed Response

Before 3 p.m. ET on Monday, April 15, two explosions at the Boston Marathon killed three people and injured more than 180 others, and turned the race into what ABC News said resembled "a war zone."

The explosions occurred almost simultaneously near the race's finish line on Boylston Street, which was crowded with runners and spectators, according to ABC. Thousands of runners were still completing the race at the time of the first explosion.

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