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Dr. David Baum told NBC Chicago that he was about 100 yards away from where people were shot and killed during the Fourth of July parade in the Chicago suburb.

Baum described hearing the "pow, pow" of a "Howitzer-type" weapon and that people began screaming and scattering moments after.

"You saw blood everywhere. You saw bodies down. You saw people screaming, you saw massive amounts of blood in the people who were gone," Baum told NBC. "There were a lot of bodies. Who was expecting to need 15 ambulances on the scene of our Highland Park parade?"

While his family ran off, Baum said he stayed at the scene with several others — including a nurse, a surgeon, and an emergency room doctor — to help the injured.

"I didn't know what I could do, but I wasn't going to leave," Baum said. "All we could do

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