Jakarta , Indonesia ( CNN ) -- A crash involving two trains in central Indonesia Saturday killed 36 people and injured 26 , officials said . The crash occurred when a train traveling from Semarang in Central Java to the capital of Jakarta was struck from behind by another train headed to Jakarta from Surabaya in East Java , according to Bambang Ervan , transport ministry spokesman . Four coaches have been lifted off the track , and one remains , said Sugeng Priyono , spokesman for the Indonesian railway company . Many people were crushed in the last carriage of the first train , which was stationary when the other train slammed into it , survivors said . `` Suddenly I heard a very loud sound from behind , '' said Anwar Riksono , a passenger who was sleeping when the trains crashed . `` It shook so hard and the lights went off . '' A crane lifted away large pieces of the train , mangled beyond recognition . The transportation ministry says it is investigating whether the crash was caused by human or technical error .
NEW : 36 people are dead and 26 are injured . Indonesia 's transport ministry says one train struck another from behind . The crash happened in the city of Padang, about 100 miles east of Jakarta. The cause of the crash is unclear .