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National Guard members bravely fired back during the Washington, D.C. attack in the moments before the suspect's capture ... newly released video shows.

The witness video, obtained by the Wall Street Journal , appears to show suspect Rahmanullah Lakanwal with a revolver in his hand, and you can hear gunfire from a National Guard member as they return fire. You can also see a U.S. soldier on the ground.

As we've reported, Staff Sgt. Andrew Wolfe and specialist Sarah Beckstrom were both shot during the Wednesday afternoon attack ... and 20-year-old Beckstrom died Thursday from her injuries . Sgt. Wolfe remains in critical condition. Wall Street Journal

These new images of the intense firefight -- just 3 blocks from the White House -- we

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