Remembering the first World Trade Center attack 22 years later

It was a snowy Friday morning 22 years ago today when terrorists detonated a truck bomb in the parking garage of the World Trade Center's North Tower on Feb. 26, 1993. Six people were killed and more than 1,000 injured in the first attack at New York City's landmark "Twin Towers."

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. 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.

Six Islamic extremists, including mastermind Ramzi Yousef, were convicted of carrying out the attack (AP/ABC News)

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