Footage compiled by FBI shows Dzhokhar Tsarnaev on days later of bombing . Seen walking through Boston with brother Tamerlan before twin blasts . Tsarnaev stops outside restaurant , calls brother and waits for explosion . While shocked crowds turn to look , he escapes before second blast . Security footage has him still in the frame when deadly blast occurs . Later seen running through the streets without his backpack , pushing his way through the crowds . Just 30 minutes later , he is seen calmly shopping for a gallon of milk at a Whole Foods store in Cambridge . Tsarnaev , who is facing death penalty , admits carrying out the attack . Defense attorneys say he was influenced by his older brother , who was killed days laters later in a gun battle .
Footage compiled by FBI shows Dzhokhar Tsarnaev on day of bombing . Seen walking through Boston with brother Tamerlan before twin blasts . Tsarnaev stops outside restaurant , calls brother and waits for explosion . While shocked crowds turn to look , he escapes before second blast . Security footage has him still in the frame when deadly blast occurs . Later seen running through the streets without his backpack , pushing his way through the crowds . Just 30 minutes later , he is seen calmly shopping for a gallon of milk at a Whole Foods store in Cambridge . Tsarnaev , who is facing death penalty , admits carrying out the attack . Defense attorneys say he was influenced by his older brother , who was killed days later in a gun battle .