James Hardy/PhotoAlto Agency RF Collections/Getty Images(NEW YORK) -- Tuesday marks the 20th anniversary of the 1993 World Trade Center bombing, which was overshadowed eight years later by the 9/11 attacks.Six people died and about 1,000 were injured after terrorists detonated a truck bomb in the parking garage of the World Trade Center's North Tower on Feb. 26, 1993.Four of the six killed -- Robert Kirkpatrick, 61, Stephen A. Knapp, 47, William Macko, 57, and Monica Rodriguez Smith, 35 -- were employees of the Port Authority of New York and New Jersey, which owned the buildings.  John DiGiovanni, 45, a dental-supply salesman visiting the World Trade Center, and Wilfredo Mercado, 37, a purchasing agent for Windows on the World restaurant, also died.A moment of silence will be held for the victims on Tuesday at 12:18 p.m. ET. Copyright 2013 ABC News Radio

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