From the Oklahoma City National Memorial and Museum website:
On the morning of April 19, 1995, Timothy McVeigh parked a rental truck with explosives in front of the Alfred P. Murrah Federal Building and at 9:02am, a massive explosion occurred which sheared the entire north side of the building, killing 168 people.
The Alfred P. Murrah Federal Building was a United States Government office building located in Oklahoma City, Oklahoma. The federal building was constructed in 1977 at a cost of $14.5 million, and was named for federal judge Alfred P. Murrah, an Oklahoma native. By the 1990s the building contained regional offices for the Secret Service, the Drug Enforcement Agency (D.E.A.), and the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), and other agencies.
Following the investigation which resulted in the execution of Timothy McVeigh and the sentence of life without parole for Terry Nichols, the surviving structure was demolished with explosives on May 23, 1995. The entire 3.3 acre site subsequently became home to the Oklahoma City National Memorial & Museum, a place to honor the victims, survivors and rescue workers, and to learn the impact of violence.
For more information see the website which includes a 360 view of the Memorial.