Families of firefighters who died in the September 11th attacks are speaking out against President Barack Obama's order to suspend all trials at Guantanamo Bay.

"Our kids were heroes. They ran into those buildings when they didn't have to, and we demand justice," said Jim Riches, father of a September 11th victim. "We want to be part of this system to be sure it's done right."

A collection of family members, including Riches, have written a letter to the president calling on him to bring speedy prosecution to Guantanamo detainees.

Last week, Obama called for all such trials to be stopped until further review.

"My son cannot speak for himself, nor can the nearly 3,000 individuals who were murdered on September 11th," said Maureen Santora, the mother of a 9/11 victim. "It is our obligation as citizens of the U.S. to make sure that those who have committed these crimes are brought to justice."

Riches recently attended court hearings for Khalid Sheik Mohammed, the reported mastermind of the attacks. Mohammed has offered to confess -- opposing Obama's suggested 120-day cooling off period to develop a plan for Guantanamo.

Riches says if there is substantial evidence against Mohammed and other accused terrorists, they should be tried by either a military commission or federal court. He says the courtroom behavior of men like Mohammed, taunts victims' families.

"I was outraged," he said. "I wanted to go through the glass. I can't understand in a country like this, these guys are standing up, admitting their guilt, that they haven't been tried fairly. It's just been messed up since day one."

Obama also signed an executive order last week calling for Guantanamo to be closed within a year.

It remains unclear what will happen to the more than 200 detainees currently held there.