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Rescuers work on the site of a train accident in the railway station of Bretigny-sur-Orge on July 12, 2013 near Paris. At least seven people were dead and dozens injured after a speeding train split in two and derailed at a station in the southern suburbs of Paris, officials said. AFP PHOTO /KENZO TRIBOUILLARD/AFP/Getty Images ( 521311998 )

A Red Cross worker attends to a person on a stretcher at the site of a train accident in the railway station of Bretigny-sur-Orge, Friday, July 12, 2013 near Paris. (AP Photo/Kenzo Tribouillard, Pool) ( France Train Crash )

French President Francois Hollande (3rdR) is surrounded by victims and rescue workers during a visit on the site of an intercity train accident at the Bretigny-sur-Orge train station near Paris July 12, 2013. REUTERS/Kenzo Tribouillard/Pool ( FRANCE-TRAIN/ )

A fireman and a rescue worker evacuate an injured man after an intercity train accident at the Bretigny-sur-Orge train station near Paris July 12, 2013. REUTERS/Benoit Tessier ( FRANCE-TRAIN/ )

People look at a derailed intercity train after an accident at Bretigny-sur-Orge train station near Paris in this July 12, 2013 picture provided by tgorguet via Instagram. REUTERS/tgorguet via Instagram/Handout via Reuters ( FRANCE-TRAIN/ )

A general view shows the scene of an intercity train accident at the Bretigny-sur-Orge train station near Paris July 12, 2013. REUTERS/Benoit Tessier ( FRANCE-TRAIN/ )

Firefighters are seen on the roof of train after an intercity train accident at the Bretigny-sur-Orge station near Paris July 12, 2013. REUTERS/Benoit Tessier ( FRANCE-TRAIN/ )

French President Francois Hollande comforts victims during a visit on the site of an intercity train accident at the Bretigny-sur-Orge train station near Paris July 12, 2013. REUTERS/Kenzo Tribouillard/Pool ( FRANCE-TRAIN/ )

French President Francois Hollande (L) talks with junior minister for Transport and Maritime Economy Frederic Cuvillier (2ndR) and national rail company SNCF head Guillaume Pepy (2ndL) during a visit on the site of an intercity train accident at the Bretigny-sur-Orge train station near Paris July 12, 2013. REUTERS/Kenzo Tribouillard/Pool ( FRANCE-TRAIN/ )

A picture shows a derailed wagon on the site of a train accident in the railway station of Bretigny-sur-Orge on July 12, 2013 near Paris. AFP PHOTO /KENZO TRIBOUILLARD/AFP/Getty Images ( 521309185 )

A woman holds a child amidst rail workers and Red Cross workers on the site of a train accident in the railway station of Bretigny-sur-Orge, Friday, July 12, 2013 near Paris. (AP Photo/Kenzo Tribouillard, POOL) ( France Train Crash )

Rescue workers tend to victims at the site of a train accident in the railway station of Bretigny-sur-Orge, Friday, July 12, 2013 near Paris. (AP Photo/Kenzo Tribouillard, Pool) ( France Train Crash )

A man with a blood-splattered shirt sits on a bench among victims and emergency workers, on the site of a train accident in the railway station of Bretigny-sur-Orge, Friday, July 12, 2013 near Paris. (AP Photo/Kenzo Tribouillard, Pool) ( France Train Crash )

A picture shows a derailed wagon on the site of a train accident in the railway station of Bretigny-sur-Orge on July 12, 2013 near Paris. AFP PHOTO /KENZO TRIBOUILLARD/AFP/Getty Images ( 521309460 )

A man with a blood-stained shirt walks on the site of a train accident in the railway station of Bretigny-sur-Orge on July 12, 2013 near Paris. AFP PHOTO / MARTIN BUREAU/AFP/Getty Images ( 521310633 )

A rescuer evacuates a victim on the site of a train accident on July 12, 2013 at the railway station of Bretigny-sur-Orge, near Paris. AFP PHOTO / MARTIN BUREAU/AFP/Getty Images ( 521311144 )

A picture shows a derailed wagon on the site of a train accident in the railway station of Bretigny-sur-Orge on July 12, 2013 near Paris. dent that caused "many casualties", authorities said. AFP PHOTO /KENZO TRIBOUILLARD/AFP/Getty Images ( 521309523 )

A Red Cross worker attends to a person on a stretcher at the site of a train accident in the railway station of Bretigny-sur-Orge, near Paris, on July 12, 2013. AFP PHOTO / POOL / KENZO TRIBOUILLARD/AFP/Getty Images ( 521311159 )

A helicopter takes to the air as rescuers prepare to evacuate victims on the site of a train accident on July 12, 2013 at the railway station of Bretigny-sur-Orge, near Paris. AFP PHOTO / MARTIN BUREAU/AFP/Getty Images ( 521311311 )

Rescue workers evacuate a victim at the site of a train accident on July 12, 2013 at the railway station of Bretigny-sur-Orge, near Paris. AFP PHOTO / MARTIN BUREAU/AFP/Getty Images ( 521311720 )

Rescuers work on the site of a train accident in the railway station of Bretigny-sur-Orge on July 12, 2013 near Paris. AFP PHOTO /KENZO TRIBOUILLARD/AFP/Getty Images ( 521312007 )