Rumour is that the engine ( or at least a large part of it) actually fell off the wing. Landed back safely, AF is extremely quiet about it. If that is the case it is an accident not an incident and the BEA should investigate.
On one of the insurers incidents/accidents logging site there is an entry on 01.09.2010 for an A340-300 (F-GCZM) from CDG to BOG returning after " technical problems " to CDG. Could be the one. No guarantee.