Three hours after two blasts ripped through the finish line of the Boston Marathon, President Obama held a press conference, pledging to find the perpetrators. “We will find out who did this and we will hold them accountable,” he said. The U.S. does not yet know who planted the explosives or why, but he says he has been in touch with federal and Massachusetts officials. The blasts killed at least two people and injured at least 50.
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