Security heightens around Kremlin, near the makeshift memorial where politician Boris Nemtsov was killed and ahead of a planned march by the opposition supporters. Rough Cut (no reporter narration)
ROUGH CUT (NO REPORTER NARRATION) STORY: A pile of flowers continued to grow on a bridge near the Kremlin early on Sunday (March 1) as Russian mourners paid tribute to slain opposition politician Boris Nemtsov. Security was heightened at the makeshift memorial where former deputy prime minister Nemtsov was shot dead late on Friday (February 27). Opposition supporters will march through Moscow on Sunday in memory of Nemtsov, whose murder has increased concern about Russia's future among opponents of President Vladimir Putin. National investigators who answer to President Vladimir Putin say they are pursuing several lines of inquiry, including the possibility that Nemtsov, a Jew, was killed by radical Islamists or that the opposition killed him to blacken the president's name. Putin's opponents say such suggestions show the cynicism of Russia's leaders as they whip up nationalism, hatred and anti-Western hysteria to rally support for his policies on Ukraine and deflect blame for an economic crisis. Putin has described the killing as a "provocation", and told Nemtsov's mother that the killers would be found and punished. Nemtsov had said in an interview that he feared Putin may want him dead because of his outspoken criticism of Russia's role in Ukraine. Others saw the murder as a result of a climate of fear where Putin demands total loyalty and supporters go to great lengths to do what they think may please him.