There has been significant progress in the investigation into journalist Pavel Sheremet's killing in Kyiv, but this information cannot be made public in order to safeguard the investigation, Ukrainian Prosecutor General Yuriy Lutsenko said.

"There is no information that can be made public in the Sheremet case. There has been serious progress in the investigation, but it is not public," Lutsenko said at a news briefing in Kyiv on Wednesday.

Sheremet was killed when a car he was driving was blown up in central Kyiv on July 20. Media said the car belonged to Olena Prytula, head of the Ukrainska Pravda online publication, but that she was not in it at the moment of the attack.