It has been 21 years since the Oklahoma City bombing, which killed 168 people and injured more than 650 others. The attack targeted the Alfred P. Murrah Federal Building in downtown Oklahoma City.
Oklahoma City bombing flashback
Rescue crews and agents from several federal agencies standin front of the remains of the Alfred Murrah Federal Building in downtown Oklahoma City on May 5, 1995, during a memorial service in memory of the victims who died in the April 19, 1995, bombing. (Roberto Schmidt, AFP/Getty Images)
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