Deadly Plot Thwarted at Courthouse in Georgia

Man armed with an assault rifle and explosives was killed by police before executing his deadly plan.
1:47 | 06/06/14

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Transcript for Deadly Plot Thwarted at Courthouse in Georgia
Armed with explosives and just listen. You can hear the sirens you can see the orange smoke there and now word of a hero on the scene ABC's Steve -- Sami is there. That's the sound of gunfire just before lunch at the Forsyth County courthouse north of Atlanta and eyewitness across the street reporting on a cell -- -- -- -- -- Police say the gunman was an anti government sovereign citizen who had a court hearing today on drug and weapons charges. They say that Dennis Marx was trying to drive this silver SUV into the front of the courthouse and shot a deputy working outside. Deputy Daniel Ross fired back and save the day. It is very close -- catastrophe and the deputy that was shot -- -- -- -- -- -- -- -- Witnesses say other officers instantly swarmed the scene shooting at the gunman killing him in a hail of gunfire. Guard jumped the curb and landed right not a -- stands. And then the police -- loved the shot believes out of the car and in the -- -- on the ground. Police say -- came prepared to occupy the -- house armed with several explosives smoke grenades that you see in this video and plenty of ammunition the FBI says so called sovereign citizens are domestic terrorists today 300000 strong. Many refuse to pay taxes and believe the government is illegitimate. Police were worried that the gunman's home was booby -- they say they can't say it enough tonight that that deputy saved many many lives he's hospitalized but he's okay.

This transcript has been automatically generated and may not be 100% accurate.

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