Several hundred people have gathered at the former site of the Oklahoma City federal building to commemorate the 20th anniversary of the terrorist bombing there that killed 168 people and injured many others. Survivors of the April 19, 1995, attack and relatives of some of the dead are among those attending today's memorial service. The service is set to begin at 9:02am, which was when the bomb detonated, with a 168-second moment of silence followed by a reading of the names of those killed.
Former President Bill Clinton and Oklahoma Gov. Mary Fallin are expected to speak at the gathering. Timothy McVeigh, an Army veteran with strong anti-government views, was executed for carrying out the bombing. His accomplice, Terry Nichols, is serving life in prison. The AP has its original report on the bombing here. (Read more Oklahoma City bombing stories.)