Tens of thousands have turned out for a memorial march in Moscow after the murder of prominent Russian opposition figure Boris Nemtsov.<br /><br /> The former deputy prime minister and fierce critic of the Kremlin was gunned down as he walked home with his girlfriend on Friday night. <br /><br /> The killing took place just 200 metres from the Kremlin, and came just before Nemtsov was due to lead a big rally against the war in Ukraine.<br /><br /> That rally transformed into the memorial march, which has been approved by the authorities.<br /><br /> Investigators are examining security footage recorded at the time of the killing, some of which has been shown on Russian television.<br /><br /> Nemtsov is seen walking with his girlfriend and another person is then seen running from the spot and getting into a car that stops nearby.<br /><br /> Russian authorities are promising a full investigation to hunt down the killers, but the opposition is voicing scepticism that the truth will ever be uncovered.
