The first terrorist attack on the World Trade Center occurred on February 26, 1993, at 12:17 PM. A truck filled with 680 kg of explosives, planted by Ramzi Yousef, exploded in the underground garage of the 1 WTC. The bombing created a 30 m (100 ft) hole through five sublevels. Six people were killed and 1,042 others were injured during escape attempts. Many people inside the tower were forced to walk down darkened stairwells with no emergency lighting, some taking two hours or more to reach safety. As a memorial to the victims of the bombing of the tower, a reflecting pool was installed with the names of those who were killed.