The Columbine High School massacre in Littleton, Colorado, on April 20, 1999, marked one of the most pivotal and tragic turning points in modern law enforcement history. When the attack began, police and SWAT teams surrounded the school but did not immediately enter, standard procedure at the time prioritized containment and waiting for specialized units. The delay, however, drew intense public scrutiny after it was revealed that many victims had been wounded but alive inside the building for ne
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