A memorial ceremony was held Thursday in honor of the victims of the first attack on the World Trade Center 22 years ago.

Held at the September 11th Memorial fountain, the service opened with the arrival of the color guard.

Dozens of mourners then joined in a moment of silence in honor of the victims at 12:18 p.m., which is when the bomb went off.

"As painful as it is to walk through that day, it's so important in keeping the memory alive and to educate people that this happened and this can happen, so I hope it doesn't ever happen again," said Michael Macko, the son of one of the victims.

Six people were killed when a 1,200 pound truck bomb exploded in a parking garage underneath the Twin Towers on February 26, 1993.

More than 1,000 other people were hurt.

Six people were later convicted in the case, including Ramzi Yousef, the nephew of self-proclaimed September 11th mastermind Khalid Sheikh Mohammed.