At 9:02 AM on Wednesday, April 19, 1995 the Alfred P. Murrah Federal Building in downtown Oklahoma City, Oklahoma, was destroyed, killing 168 people and injuring hundreds more. More from Wikipedia More from the Encyclopedia of Oklahoma History & Culture

The Murrah Building before the bombing.

The explosion destroyed about half of the Federal Building, damaged an additional 300 buildings, and was felt as far as 30 miles away. More from NewsOK.com More from the Denver Post

This security camera photo shows the truck passing the Regency Towers Apartments five minutes before the explosion.

The truck bomb was a rented Ryder truck filled with about 5,000 pounds of explosives, including nitromethane and agricultural fertilizer.

Timothy McVeigh was stopped traveling north on I-35 90 minutes after the bombing by Oklahoma Highway Patrol trooper Charlie Hanger for driving without a license plate. He was arrested on a firearms charge, spent two days in the Perry, Oklahoma jail, and was then charged with the bombing. Terry Nichols was later arrested in Kansas and charged in the bombing on May 10.

Over 12,000 individuals assisted in the relief and rescue operations after the bombing. Many of the rescue workers have suffered from post-traumatic stress disorder, clinical depression, and anxiety because of the deeply traumatic nature of the bombing and its aftermath.

The remains of the Federal Building was demolished on May 23, 1995.

Timothy McVeigh was tried and sentenced to death by lethal injection on June 13, 1997. He was executed in Terre Haute, Indiana on June 11, 2001.

Terry Nichols was convicted as an accomplice and sentenced to life in prison on June 4, 1998.

Michael and Lori Fortier were considered accomplices for their foreknowledge of the planning of the bombing. In addition to Michael assisting McVeigh in scouting the federal building, Lori had helped McVeigh laminate a fake driver's license which was later used to rent the Ryder truck. Michael agreed to testify against McVeigh and Nichols in exchange for a reduced sentence and immunity for his wife. He was sentenced on May 27, 1998 to twelve years in prison and fined $75,000 for failing to warn authorities about the attack. On January 20, 2006, after serving ten and a half years of his sentence, including time already served, Fortier was released for good behavior into the Witness Protection Program and given a new identity.

The Oklahoma City National Memorial & Museum was established on October 9, 1997, at the site of the Federal Building. House Bill 2750 provides that courses of instruction in Oklahoma History will incorporate information about the April 19, 1995, bombing of the Alfred P. Murrah Building and the role it plays in the history of Oklahoma and our nation. The Oklahoma City National Memorial & Museum provides these resources for students and educators.