Jurors in the trial of Dzhokhar Tsarnaev have seen a video showing the suspected Boston bomber and his brother at the scene of the marathon explosions.The video pieced together CCTV footage and photos to show the brothers? movements on 15 April 2013, when two blasts at the marathon finish line killed three people and injured more than 260.The footage had never been shown publicly before.It shows the defendant and older brother Tamerlan Tsarnaev wearing baseball caps and carrying backpacks as they move through the marathon crowds.After the second blast, Tsarnaev is seen fleeing, next to scores of terrified runners and bystanders.Earlier jurors heard descriptions of horrendous injuries from survivors.Tsarnaev, 21, is on trial for the bombings.His lawyers opened their case last week by bluntly declaring that the defendant was responsible for the attack, but said he had been under the influence of his older brother.Tamerlan Tsarnaev, 26, died days later as the brothers engaged in a shoot-out with police.Despite his lawyers' admission of responsibility, Tsarnaev has not changed his plea from not guilty. If convicted, he faces the death penalty...