Photo: AP/Jim Argo
It was one of the darkest days in American history. On April 19, 1995, a powerful bomb ripped through the Alfred P. Murrah Federal Building in downtown Oklahoma City, claiming the lives of 168 people and injuring hundreds more.
Soon after, police arrested Timothy McVeigh and his accomplice, Terry Nichols. Both men were anti-government extremists with military backgrounds.
In June 1997, McVeigh was convicted of 11 counts of murder and conspiracy. Four years later, he was executed at a federal prison in Terre Haute, Indiana. Nichols is currently serving life in prison.