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Fort Hood shooter Ivan Lopez took three lives and wounded 16 others, but that number may have been a lot higher if it wasn't for a female military police officer who risked her life to bring the rampage to an end.
CNN's Brian Todd, who reported on the unidentified officer, took over the Situation Room Twitter account to answer your questions about the shooting, and what we know about her heroic acts.
Below is the conversation:
CNN's Miguel Marquez reports on Fort Hood shooter Ivan Lopez's background, medical history and personal life.
At 4 p.m. ET, Lt. Gen. Mark Milley, III Corps and Fort Hood commander will give an update on the Fort Hoot shooting incident.
At 5pm ET, "The Situation Room with Wolf Blitzer" will be digging into the latest developments surrounding the shooting. Stay tuned to this blog for real-time details.