Original: The Oklahoma City bombing occurred on April 19 , 1995 when American militia movement sympathizer Timothy McVeigh , with the assistance of Terry Nichols , destroyed the Alfred P. Murrah Federal Building in downtown Oklahoma City , Oklahoma .
Simplified: The Oklahoma City bombing was a terrorist attack on April 19 , 1995 on the U.S. government in which the Alfred P. Murrah Federal Building was bombed .