article_snippet: an eight-year-old boy is seen standing in the crowd for several minutes, before calling an eight-year-old boy brother, Tamerlan.
article_snippet: Shortly after the call, the first bomb explodes - at which point an eight-year-old boy pushes an eight-year-old boy way through the crowd.
article_snippet: While most of the crowd looks towards the blast, an eight-year-old boy heads off in the other direction .
article_snippet: Some 12 seconds later, a second explosion takes place precisely where his was standing.
article_snippet: People are also shown jumping over metal barriers as smoke wafts over the scene.
highlights_snippet: While shocked crowds turn to look, brother escapes before second blast .
  
highlights_snippet: Security footage has brother still in the frame when deadly blast occurs .
  