A French media report based on leaked documents indicated that suspect Ali M., an Algerian butcher in Vaucluse, corresponded for a year with a senior member of al Qaeda in the Islamic Maghreb over a plot to bomb the Eiffel Tower, the Louvre, and a nuclear power plant; he was arrested in June before he was to travel to Algeria for terrorist training. French authorities stepped up security on US-bound flights “for the summer period” and plan to unveil stronger antiterrorism legislation soon.