Oklahoma City bombing

In this May 5, 1995 file photo, a group of search and rescue workers attends a memorial service in front of the bombedAlfred P. Murrah Federal Building in Oklahoma City.

(Bill Waugh / Associated Press)

April 19, 2015 1:42 PM PT

Sunday marks 20 years since the bombing of the Alfred P. Murrah Federal Building, which killed 168 people and injured hundreds more in what was then the deadliest terrorist attack on U.S. soil.

Timothy McVeigh is led from the Noble County Courthouse in Perry, Okla., in 1995 after being identified as a suspect in the Oklahoma City bombing.

(John Gaps III / Associated Press)

Terry Nichols, wearing body armor, leaves the Pittsburg County Courthouse in McAlester, Okla., in 2004 after his trial on murder charges. Multiple life sentences were imposed.

(Donna McWilliam / Associated Press)

Photographs of the 168 victims of the bombing of the federal building line a wall at the Oklahoma City National Memorial Center.

(Laura Rauch / Associated Press)

Former state Rep. Susan Winchester, left center, chairwoman of the the Oklahoma City National Memorial Foundation, embraces her niece, Rosslyn Biggs, during a ceremony for the 20th anniversary of the Oklahoma City bombing. Victim Dr. Peggy Clark was the sister of Winchester and the mother of Biggs.

(Sue Ogrocki / Associated Press)

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Oklahoma City bombing

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