The Telegraph is a conservative British newspaper. Although one might not agree with the article, I don't find it unsourced. It is by a named journalist, he says what camp he visited, and the details about ING officer arrested are very exact, with names given.
I have read other stuff about ING staff being arrested, etc. A recent article alleges that they are a big source of funding for the insurgents.
This is a disturbing article. The Telegraph doesn't usually write stories with a "gotcha' agenda. I'll be happy when declare victory and get out. I don't have the feeling the ING is really trying to help our soldiers or fight for their own security. At best, they are ambivalent because, bottom line, Islam trumps everything including freedom and democracy. But at least the president has offered them a chance. If they squander the opportunity, so be it.