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Said there -- shootings like this have become all too common and like this one.
Like others it's short -- spark new arguments on both sides of the gun control issue tonight.
Chief intelligence correspondent Catherine Herridge looks at the history.
And -- particularly gruesome year.
You can ever be prepared for this kind of incident.
What has happened what has transpired at that school building.
Will leave a mark on this community and that every family what impact it.
-- is -- searing images from Newtown Connecticut the panic in a mall in Portland Oregon on Tuesday went to holiday shoppers were killed by a single shooter.
Or this mass murder and a sikh temple and Wisconsin where seven were killed in August and their crimes and begin to explain the law.
The statistics overall provide cold comfort for what happened today.
And look at an event like today and you think we've got a problem we've got to do something.
And whatever you do you need to make sure that it's something that is.
You know -- very effective.
-- the worst school shooting in US history remains Virginia Tech in 2007.
Where 32 were gunned down by -- student.
The most recent crime data from the Justice Department which runs through 2008.
Tuesday multiple victim homicides in this country are rare.
With less than 1% of these crimes involving five or more victims.
Also gun homicides by individuals in their late teens -- in each -- but the Virginia Tech gunman in Friday's alleged shooter are down.
According to federal data gun homicides by persons between eighteen and 24 -- at 861993.
And then dropped almost half that 5300.
-- -- -- -- -- eight law enforcement has been making herculean efforts to prevent exactly this sort of tragedy that we saw unfold today.
That law enforcement's disposal range from.
Gun buyback programs to background checks to targeted efforts to interdict the flow of illegal guns.
Plus schools and communities far away from -- -- on posted memorials are held services on the children and the families who will never see another birthday.
Former law enforcement says the impact is amplified in the age of instant communication.
It's not that common boat when it happened it's very widely publicized.
Schools are taking additional precautions at this point in time.
To protect their teachers as well as the students and doing drills periodically during the school year.
Since April of this year seven major shootings in the US alone all involving a single shooter with multiple deaths.
What's not clear tonight is whether this represents any kind of uptick in the national statistics long term threat.
-- and thank you.
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