PARIS, March 21 (Reuters) - A gunman suspected of killing of seven people in the name of al Qaeda was arrested by police in southwest France after a nearly 12-hour operation in the city ofToulouse, French television channels BFM TV and i-Tele reported on Wednesday. One police source who is not directly linked to the investigation confirmed the arrest to Reuters, but several other sources said they were not aware of it. The TV channels cited police sources for the information, without providing further details. It was not immediately possible to confirm this. French President Nicolas Sarkozy is expected to speak to the nation this afternoon. (Reporting By Daniel Flynn; editing by Leigh Thomas and Geert De Clercq) Copyright 2012 Thomson Reuters. Click for Restrictions.