BOSTON (CBS) – New video of the Boston Marathon bombings has been released.

Surveillance video from Marathon Sports shows the explosion shatter the store’s windows. Victims literally stagger and leap into the store, badly injured. People quickly grab clothing off the store racks and make tourniquets, doing anything they can to stop the bleeding.

Another video shot by a North Carolina man shows the chaos on Boylston Street. Jurors watched both of the graphic videos as Dzhokhar Tsarnaev went on trial for his role in the bombings.

WBZ-TV’s Beth Germano reports

During testimony, Shane O’Hara, the manager of Marathon Sports, choked back tears as he explained the carnage and bloodshed outside his store.

“The thing that haunts me are the agonizing decisions: who do you help first, who needs it more,” he said. “That was never my role, to make that decision.”

Three people were killed and more than 260 were hurt when two pressure cooker bombs exploded near the finish line of the marathon on Boylston Street on April 15, 2013.

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