It has been 20 years since the Oklahoma City bombing in the south-central U.S. state of Oklahoma. A car bomb that exploded April 19, 1995 at the Alfred P. Murrah Federal Building in Oklahoma City killed 168 people, and remains the worst U.S. act of domestic terrorism.
US Remembers Oklahoma City Bombing 20 Years Later

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FILE - In this April 21, 1995 file photo, Timothy James McVeigh is lead out of the Noble County Courthouse by state and federal law enforcement officials in Perry, Okla., after being identified as a suspect in the bombing of the Oklahoma City Federal buil

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FILE - In this April 24, 1995 file photo, an Oklahoma City police car decorated with the words, "We will never forget," and a small American flag sits near the Alfred P. Murrah Federal Building in Oklahoma City.

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FILE - In this May 3, 2001 file photo, a view from the plaza overlooking the Oklahoma City National Memorial site is seen. There are 168 chairs, one for each of the victims killed in the bombing of the Alfred P. Murrah Federal Building April 19, 1995.