Jurors saw graphic scenes of a street awash in blood and severed limbs and the dazed, traumatized expressions on people’s faces. They heard screams and moans. It looked like a war zone, several witnesses said.

Other witnesses described how deafening and disorienting it was to have a bomb go off nearby. Some survivors said they could see people screaming but could not hear them. They felt like they were underwater as the surreal events unfolded around them. Several said they felt nauseated by the “vile” stench of gunpowder and burning hair and flesh.

The jury heard a young woman, now in college, describe how it felt to nearly die; Sydney Corcoran said she felt cold, but peaceful as the blood drained from her body.

As they viewed a video shot by spectator Colton Kilgore, jurors could hear the cries of a 5-year-old boy. They saw his mother’s bones protruding from her leg and shredded hand as she reached for him. Others in the background were scrambling to apply tourniquets.

“My bones were laying next to me on the sidewalk,” said Rebekah Gregory. “That’s the day I thought I was going to die.”

They heard the urgent voices of spectators suddenly turned into first responders. Tourniquets were quickly fashioned from belts and running clothes brought by the armload from Marathon Sports, a store near the first bomb site along Boylston Street.

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Dzhokhar Tsarnaev