A federal police officer patrols with a security dog outside federal court, Wednesday, March 4, 2015, in Boston, on the first day of the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev. Tsarnaev is charged with conspiring with his brother to place two bombs near the marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Steven Senne)
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