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By Gabriela Baczynska and Aleksandar Vasovic KIEV/DONETSK Ukraine (Reuters) - Ukraine said its troops had taken more territory from pro-Russian rebels near the site where Malaysian flight MH17 was brought down, as international investigators said fighting was preventing them reaching the crash location. Ukrainian officials said two rebel-held towns had been recaptured and attempts were being made to take a village Kiev says was near the launch site of the surface-to-air missile that shot down the airliner with loss of all 298 on board. Analysis of black box flight recorders from the airliner showed it was destroyed by shrapnel from a missile blast which caused a "massive explosive decompression", a Ukrainian official said on Monday. In a report on three months of fighting between government forces and separatist rebels who have set up pro-Russian "republics" in the east, the United Nations said more than 1,100 people had been killed.