WATCH: New Boston Bombing Surveillance Video

Above is the surveillance video presented to juror in the trial against alleged Boston Bomber Dzhokar Tsarnaev on Wednesday.

It was a part of a testimony by Boyston Street Marathon Sports store manager Shane O’Hara. In the video, O’Hara, his staff, and patrons can be seen reacting to the blast. Afterwards they are shown aiding the wounded and using clothes to make makeshift tourniquets.

The trial began this week and has featured victims affected by the bombing, many of whom lost limbs.