This aerial picture taken on June 6, 2016, shows the scene of a collision between a freight train and a passengers train on their way between Liege and Namur, in Saint-Georges-sur-Meuse, Eastern Belgium. Investigators worked through the wreckage of a high speed train crash in eastern Belgium on Monday that killed at least three people and injured nine others. A fast-moving passenger train late Sunday slammed violently into the back of a slow-moving freight train that was travelling on the same track for reasons that remain unexplained. (Photo by Laurie Dieffembacq/AFP Photo)





An official inspects the wreckage of a passenger train after it crashed into the back of a freight train as a barge with a Belgian flag drives past, in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





General view of a crash between a passenger train and a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





Officials stand near the wreckage of a passenger train after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





An official inspects the wreckage of a passenger train after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





An official stands inside a passenger train after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





The wreckage of a passenger train is pictured after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





An official inspects the wreckage of a passenger train after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





A police officer stands in front of the wreckage of a passenger train after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





The wreckage of a passenger train is pictured after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





An official inspects the wreckage of a passenger train after it crashed into the back of a freight train, in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





The wreckage of a passenger train is pictured after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





Officials stand near the wreckage of a passenger train after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





The wreckage of a passenger train is pictured after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





The wreckage of a passenger train is pictured after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)





A damaged window of a passenger train is pictured after it crashed into the back of a freight train in the eastern Belgian municipality of Saint-Georges-Sur-Meuse, June 6, 2016. (Photo by Francois Lenoir/Reuters)