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White House Reacts to Boston Bombing With Heighted Security

President Obama responds to the blast, and Pennsylvania Avenue in front of the White House is closed
01:55 | 04/15/2013

Transcript for White House Reacts to Boston Bombing With Heighted Security

Pennsylvania Avenue in front of the White House was shut down and shortly before we came on the -- the president addressed the nation. Here's ABC's chief White House correspondent Jonathan Karl Jon.... See More
This transcript has been automatically generated and may not be 100% accurate.
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