article_snippet: New surveillance footage of a Boston bomber laying an explosive then fleeing the scene has been shown in court.
article_snippet: Footage shows Dzhokhar Tsarnaev walking through Dzhokhar Tsarnaev before pausing near the finish line, where Dzhokhar Tsarnaev dropped an explosive charge that killed an eight-year-old boy.
article_snippet: Dzhokhar Tsarnaev managed to clear the blast zone in the 12 seconds between the first bomb exploding and an eight-year-old boy going off - but is still in the shot from a surveillance camera at the scene.
article_snippet: Shock: Dzhokhar Tsarnaev, cirlced top left, is pictured above in FBI surveillance video standing in a crowd the moment the first bomb goes off at the Boston marathon.
article_snippet: Pictured above is the moment Dzhokhar Tsarnaev's pressure cooker bomb exploded.
article_snippet: Tsarnaev's pressure cooker bomb killed two people and wounded dozens more .
article_snippet: It is unclear exactly how the first bomb was detonated - though early claims that the first bomb primitive kitchen-timer device seem to be endorsed by the fact that Tsarnaev was still fleeing when the first bomb went off.
article_snippet: He is the only surviving bomber, as Tamerlan Tsarnaev was killed in a gun battle days after the attacks.
article_snippet: Seconds later, the second bomb explodes, and Tsarnaev, who prosecutors say detonated the second bomb, is seen running with a crowd of people who also are running, pushing some out of Tamerlan way to flee the scene.
article_snippet: On the run: This FBI video shows Dzhokhar Tsarnaev fleeing the scene of the bombing after setting Dzhokhar Tsarnaev explosive.
article_snippet: Three people died and more than 260 were injured when two pressure-cooker bombs filled with shrapnel exploded near the finish line.
highlights_snippet: Footage compiled by FBI shows Dzhokhar Tsarnaev on day of bombing .
  