Solemn tributes mark Boston Marathon bombing
Today marks the anniversary of the Boston Marathon bombings.
A total of three people were killed and 260 wounded when two bombs exploded at the finish line.
Brothers Tamerlan and Dzhokar Tsarnaev were charged with planning and orchestrating the attack. Tamerlan died following a shootout with police days after the bombings.
Dzhokhar was found in a backyard boat, and is awaiting...