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In this file photo of Feb. 26, 1993, helicopters jockey for position over the World Trade Center in New York following a noontime blast, which rocked the twin towers complex. Twenty years ago a group of terrorists blew up explosives in an underground parking garage under one of the towers, killing six people and ushering in an era of terrorism on American soil. (AP Photo/Ron Frehm, File)

NYC marks 20th anniversary of World Trade Center bombing

A ceremony honoring six people who died 20 years ago

in the first terrorist attack on the World Trade Center was held Feb. 26 at the 9-11 memorial, where the twin towers were destroyed eight

years later. More than 1,000 people were injured in the 1993 blast in an underground garage

below one of the towers.