A moment of silence has been observed to honor the six people who died 20 years ago in the first terrorist attack on the World Trade Center.

Victim waves flag out a window of World Trade Center following 1993 bombing (WPIX TV)

A bell tolled at 12:18 p.m., the time when a truck bomb was detonated below the north tower.

The ceremony was held Tuesday 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.

The names of the victims were read by family members before bagpipers played "Amazing Grace."

Six Islamic extremists were convicted of carrying out the bombing, including mastermind Ramzi Yousef.


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