Columbine: Worst case scenario

Eric Harris and Dylan Klebold's original plans were as follows:

1. Blow up the lunchroom of Columbine during the busiest time of day, killing hundreds of students. Then shoot any survivors fleeing from the school.

2. Then, as police vehicles, ambulances, fire trucks, and reporters came to the school, bombs set in one of the boys' cars would detonate, killing these emergency and other personnel.

3. Then, Eric and Kleboid would hijack a plane at a Denver airport and crash into a building in NYC. Let's say in this situation, they hit one of the WTC or the Empire State building.

How would the world react to this? The worst terrorist attack on US soil, caused by two bullied teenagers? How would the US change because of this?
 
The first part is achievable, so long as they make the bombs correctly. The second part might happen, but with more working parts in the plan, the chances that it'll fail get higher with each added step.

The third part? Hell no. No way that that happens.

The reaction to at least a hundred people killed or injured in an American school would be tremendous though. I envision metal detectors being mandatory in every school building. At very least.
 
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