Russian tycoon Mikhail Khodorkovsky said he would try to find those responsible for the murder of three journalists working for his online news organization in Central African Republic who he said had been reporting on Russian mercenaries.

Orhan Dzhemal, Alexander Rastorguyev and Kirill Radchenko were working for TsUR, which is financed by Kremlin critic Khodorkovsky, when they were ambushed on Monday.

"I will make efforts to identify those responsible," Khodorkovsky, who now lives outside Russia, wrote on social media, giving no further details on what he intended to do.