What kind of sites are those? They look VERY FAR LEFT to me.
Hard to give them any credence.
La Repubblica is an Italian Leftist magazine which, for whatever reason, has been central to the story. Trying to discredit what they have to say on the basis of broad partisan generalizations is rubbish (to be polite). If you don't like their facts or reasoning then show me their errors.
At this point I believe the CIA obtained copies or summaries of the forgeries in Dec 2001/Jan 2002, might have had other indications that Iraq was buying or attempting to buy yellowcake from Niger, sent Wilson, our Ambassador to Niger, and a 4 star general with experience in Africa (Carlton ?) to check, determined or should have determined that the documents were forgeries, and came to whatever conclusions they came to. I believe the documents were forged by some Nigerien crook in order to obtain a few thousand bucks.
What happened next is the mystery.