The plot seemed to involve kidnapping of a relative of a nuclear scientist. Details are sketchy, and sound like the plot of a spy novel. And some of the details seem to come from a taxi driver in Brussels. A posting March 22 gives earlier stories about a possible plot which the media had softpedaled.
Experts on NBC said that it is very unlikely this plan could have been carried out.
I did tweet this report out from the NBC site moments ago, and it copied to Facebook.
In France, another major arrest was made today, unrelated.