Tributes paid after Boris Nemtsov death

The Russian government has strongly denied allegations that it was involved in the killing of opposition politician Boris Nemtsov.

Nemtsov who was a former deputy Prime Minister and prominent critic of President Vladimir Putin was shot in the back four times, just meters from the Kremlin.

People have gathered in Moscow to pay tribute to the politician and western leaders have called on the Russian authorities to carry out a full investigation into the killing.

Sarah Rainsford reports from Moscow.