article_snippet: four days after the bombing.
article_snippet: They contend Tamerlan was the driving force behind the . attacks and that Tamerlan younger sibling followed out of .
article_snippet: Facebook and having told the FBI that Stephan Silva believed the bombing must have been Tamerlan's idea. '
article_snippet: U.S. a decade before the attack.
article_snippet: after a day-long lock down was lifted and finding a person in a person .
article_snippet: the bombing, WBZ reported. '
article_snippet: the bombing killed restaurant manager Krystle Campbell, 29, .