High-quality surveillance video of gunmen shooting up a crowded Philadelphia bus comes from a camera that was only recently installed.
And the prosecutor in the trial of four suspects in the case says the video takes things to a "whole new level."
It was, remarks CBS News Correspondent Elaine Quijano, like a scene from the Wild West, but with a modern twist - the video.
According to prosecutors, Penny Chapman, seen in the video -- boarded the bus with her young on June 18, and can be seen in the video spanking him, for running through the aisles.
A male rider intervened, saying he would report her to child services.
Chapman is then seen making a phone call and, minutes later, two gunmen in white shirts are outside the bus.
Investigators say she called the suspects to come and shoot the man who threatened her.
After Chapman exits through the back door, a third suspect holds the doors open as the two gunmen begin shooting. Some passengers scrambled to the front of the bus, piling on top of each other, for cover.
Philadelphia Assistant District Attorney Morgan Model Vedejs told reporters, "You can see where the shots actually hit was exactly where people were standing and sitting, had they not moved."
During the chaos, you can also see an 80-yr old woman who seems to be in shock, standing frozen in place.
"You see her very clearly," Vedejs said, "because she doesn't actually realize what's going on."
Just in the nick of time, the woman ducks as a bullet shoots through the window, barely missing her head.
Miraculously, no one on the bus was harmed.
But all three men and Chapman are facing attempted murder, assault and firearms charges, Vedejs told "Early Show on Saturday Morning" fill-in co-anchor Nancy Cordes.
Vedejs credits the bus driver and quick-thinking of the passengers for everyone escaping injury.
"The video shows one shot does actually get off before the back doors close," Vedejs told Cordes, "but by then, the driver of the bus takes off, full speed ahead toward Temple Hospital, and the passengers had the wherewithal to separate quickly to the front and back."
Vedejs called it an "absolutely horrific scene. And we are extremely lucky that (the Philadelphia transit system) has such a fabulous surveillance system that we're able to see it.
"You hear (of) these things. You can sort of picture them when you hear it, but when you actually are able to see it, it takes things to a whole new level."
The arrests were made largely through the work of veteran Police Officer Joe Goodwin, Vedejs said.
"He's very familiar with people in that neighborhood, has very good contacts, and was able to ascertain some names and information and then, after seeing the video, he was able to actually identify them. Some people turned themselves in and others arrested either at their home or on the street."