On this day 24 years ago, terrorists detonated a bomb under the Twin Towers — killing six people and injuring many others. This tragic event, a pre-cursor to the September 11th attacks that eventually brought down the World Trade Center. Our Gene Apodaca was in Lower Manhattan Sunday reporting on that somber anniversary.

Family members of those killed in the 1993 World Trade Center attack placed flowers over the victims' names.

Six people as well as an unborn child perished when a bomb in a rented van went off underground beneath the North Tower. Those names read aloud during Sunday's ceremony.

Michael Macko was just 29-years-old when he lost his father.

"It's always bittersweet," Macko said. "It's important to remember but it's also sad remembering."

"I felt this heave in the tower itself, the tower actually lifted," said first responder Charlie Maikish.

Maikish was an executive at the Port Authority in 1993. His team not only responded to the attack but also oversaw some of the protections that would come afterward.

"The improvements we put in place quite frankly after that the communication systems and the lighting in tower of stairs, etcetera saved a lot of lives on 9/11," Maikish said.

What also followed were the arrests and convictions of those involved. 

Including convicted mastermind Omar Abdel-Rahman. The 78-year-old Egyptian cleric, also known as the "Blind Sheikh" died last week while serving life in prison. 

A death that the president and CEO of the National September 11th Memorial and Museum says does little to end the families' pain.

"I don't know that its closure exactly but that chapter this man the Blind Sheikh and the sermons he gave that were so full of the call to violence that's now a part of history," said Alice Greenwald, President and CEO of the 9/11 Memorial and Museum.