Or it could be that, you know, al Qaeda really exists, and that they are really trying to conduct terror attacks, and that the two arrested really were participating in planning for those attacks. The French had comprehensively bugged their communications and knew what they were up to. From the Daily Mail:
"Adlene Hicheur is a former research fellow at the Rutherford Appleton and still visits the UK for conferences and other meetings. He and Halim are accused of compiling information about possible targets and sending it to contacts in North Africa involved with Al Qaeda Islamic Maghreb (AQIM). ...
European intelligence sources said that Adlene Hicheur, who studied at Stanford University in California before moving to Oxfordshire, had expressed a ‘very strong wish to carry out attacks anywhere where Western security interests can be damaged’."