Investigators from international police organisation Interpol and its European equivalent, Europol, are to visit the crash site of Malaysian Airlines flight MH17.
Europol said it would contribute a specialist to a seven-person team that is set to arrive in the Ukrainian capital Kiev on Sunday morning.
However a Europol spokesman could not confirm whether the team had guarantees that they would be offered access to the crash site, which is being guarded by pro-Russian separatists.
Thousands of online users have taken to social media to call for the victims of the Malaysian airliner crash to be returned to loved ones.
United States intelligence officials admitted that they do not know who fired the surface-to-air missile that downed flight MH17.
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