Google is your friend:
Whole article - interesting, it sheds some light on this.
Apparently, we're talking about 50+ prisoners who can't return to their home countries (most probably because they'd be shot on sight). So, the US asked some European countries if they can provide asylum to these people.
Still, I see no answer to my question - why are 50 prisoners such a problem to the US? You guys boast about how welcoming your tolerant society is to immigrants, so now's the time to prove it
There has to be a reason the home countries would shoot them on sight. We send them back to wherever they are citizens. Isn't that what Canada got all pissy about regarding that one guy awhile back??