The National Police believes that the main motive for the murder of journalist Pavel Sheremet is his professional activity.
Oleksandr Vakulenko, the head of the National Police's Main Investigation Department, announced this at a news briefing, Ukrainian News Agency reports.
"The priority Version - Sheremet's professional activity as a journalist in both Ukraine and abroad," he said.
According to him, conflicts in Sheremet's personal life and significant amounts of debt are also being considered as possible motives.
Vakulenko said that 16 expert tests were conducted during the investigation.
According to him, nine of the expert tests have been completed, including explosive tests.
He said that these tests the explosives that were used to blow up the journalist's vehicle were diphenylamine and RDX.
Fragments of anti-personnel mine were also found.
In addition, according to Vakulenko, police are studying 150 terabytes of video from surveillance cameras.
Police have also questioned 1,800 people, including 300 witnesses, 324 taxi drivers and passengers, and 60 friends and relatives of the deceased.
Police have also obtained court permission to access information about 18,000 mobile-telephone connections.
As Ukrainian News Agency earlier reported, Sheremet was killed on 20 July 2016 when the vehicle in which he was traveling exploded in downtown Kyiv.
Ukraine asked the United States' Federal Bureau of Investigation (FBI) and German law enforcement agencies for assistance in investigating the crime.
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