CNN Starting Point April 25, 2013 12:04:00
The boston marathon, and where the first explosion happened on boyleston street happened. runners up and down here, also hallowed ground. >> investigators tell cnn and other news agencies at least one of the home made bombs was triggered by remote control, possibly a crucial clue. were the devices based on a blueprint in al qaeda's english language magazine "inspire" or similar to ones in camps run by dagestani militants. he and tamerlan tsavraev ever met, now one part of the massive worldwide investigator. ♪ >> he was born to be a police officer, and he lived out his dreams. ♪ >> thousand...