Why are we just now learning about the "Fort Jackson Five"?

I drive my friends and family crazy because of my obsession over the "news".   I take a great deal of pride in the fact that I stay up to date on the current events that affect the world in general and more importantly, my country in particular.  So I am more than a bit disturbed that there was an attempted terrorist attack on one of our military bases before Christmas and word of the attack is just now filtering out.  From Michelle Malkin:

Erick Stackelbeck has the exclusive on a disturbing news development at Fort Jackson in South Carolina:

CBN News has learned exclusively that five Muslim soldiers at Fort Jackson in South Carolina were arrested just before Christmas. It is unclear whether the men are still in custody. The five were part of the Arabic Translation program at the base. (emphasis added)

The men are suspected of trying to poison the food supply at Fort Jackson.

A source with intimate knowledge of the investigation, which is ongoing, told CBN News investigators suspect the “Fort Jackson Five” may have been in contact with the group of five Washington, DC area Muslims that traveled to Pakistan to wage jihad against U.S. troops in December. That group was arrested by Pakistani authorities, also just before Christmas.

Why was this information withheld from the American public?  Further, why is it "unclear whether the men are still in custody"?  These terrorists attempted to kill our servicemen on our soil, surely they haven't been turned loose.

I understand that information should not be released prior to arrests being made but once we have terrorists in custody the only reason that the government would keep the public in the dark is because the facts are embarrassing to the government. 

Well, too bad if the facts are embarrassing.  Our troops put themselves in harm's way to keep us safe.  No member of the American military should be in harm's way while on American soil.  I want to know if political correctness once again has placed our service men in danger.