Task: Question Answering
Input (English): Context : The 1984 Balkan Bulgarian Tupolev Tu-134 crash occurred on 10 January 1984 when a Balkan Bulgarian Airlines Tupolev Tu-134 airliner crashed on an international flight from Berlin Schönefeld Airport in Schönefeld, East Germany, to Sofia Airport in Sofia, Bulgaria. 
Question : When did 1984 Balkan Bulgarian Tupolev Tu-134 crash occur?
Output (English): 10 January 1984