Twenty years ago, April 19, 1995, two right-wing, anti-government domestic terrorists did this:
That's what was left of the Alfred P. Murrah Federal Building in Oklahoma City, OK, after a two ton fuel-and-fertilizer explosive was detonated by Timothy McVeigh and his accomplice Terry Nichols, killing 168 innocent people, some of them children at the building's day care center. McVeigh was subsequently executed for the crime and Nichols was sentenced to multiple life terms.
Today, there's a 20th anniversary memorial event scheduled at the site where the building once stood. Among the speakers will be former President Bill Clinton, who was serving his first term in office when the attack occurred.
