Centers for Disease Control and Prevention employees in Atlanta on Monday recalled the harrowing moment a gunman fired nearly 200 shots at multiple office buildings last week, killing a responding police officer.

Four CDC workers, who were not authorized to speak publicly, told CBS News under the condition of anonymity that they were "deeply disappointed and frustrated" by an apparent lack of leadership following Friday's shooting . Three of the four employees are mothers and all of them had differing experiences of the gunfire: one was inside a building standing in a window that would be later shot out, one was inside the daycare with her children, one was walking to their car and another was at home.

"I was walking to my car. I heard a very, very distinct and crisp pop, pop, po

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