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FILE - In this file photo of Feb. 26, 1993, the twin towers of the World Trade Center in New York City are shown in the aftermath of an explosion earlier that day. Twenty years ago a group of terrorists blew up explosives in an underground parking garage under one of the towers at the World Trade Center, killing six people and ushering in an era of terrorism on American soil. (AP Photo/Ron Frehm, File)

FILE - In this file photo of Feb. 26, 1993, the twin towers of the World Trade Center in New York City are shown in the aftermath of an explosion earlier that day. Twenty years ago a group of terrorists blew up explosives in an underground parking garage under one of the towers at the World Trade Center, 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.