Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - The first call comes from a woman inside the school.
"Sandy Hook school," she says. "I think there's somebody shooting in here. In Sandy Hook school."
"OK, what makes you think that?" the dispatcher asks.
"Because somebody has a gun. I saw a glimpse of somebody running down the hallway."