Twilight Language Calendar Events: Waco, Oklahoma City, Columbine
Monday marks the 15th anniversary of one of the darker days in American history.The bombing of the Murrah Federal Building in Oklahoma City shook the nation on April 19, 1995.
Timothy McVeigh was convicted of the crime and was later sentenced to death.
Events are planned throughout the day to remember the victims.
Also on this day in 1993, the Branch Davidian standoff in Waco came to a fiery end.
The 50-day standoff started after members of the religious sect killed four federal agents in a shootout.
When the FBI tried to move in, the compound was lit on fire. Eighty people died, including children.