Sunday marked the 19th anniversary of the first bombing of the World Trade Center, when a rental van carrying explosives was detonated in a parking garage underneath the building, killing six people and injuring more than 1,000 others.
The explosion created a five-story crater in the sub-grade levels of the World Trade Center, below a hotel in 3 World Trade Center. The bomb was intended to destroy the twin towers.
The blast killed John DiGiovanni, 45; Robert W. Kirkpatrick, 61; Stephen Kapp, 48; William Macko, 57; Wilfredo Mercado, 37 and Monica Rodriguez Smith, 34.
Their names are included in the National 9/11 Memorial in lower Manhattan, on a panel at the north pool.
This, said National 9/11 Memorial president Joe Daniels in a blog post, reminds people that the two events "are inextricably linked, and of our sacred obligation to never forget those who were killed." He also asked people to observe a moment of silence at 12:18 p.m, the time of the attack.
The first memorial to the victims was destroyed in the Sept. 11, 2001 attacks.
The memorial is also encouraging people to share their memories and experiences on Twitter. People can send messages to @Sept11memorial and use #WTC1993 to post a tribute.