Russian opposition leader gunned down

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Moscow, Russia - Former Russian Deputy Prime Minister, 55-year-old Boris Nemtsov, has been killed, shot four times in the back.

As his blood was washed from the sidewalk near the Kremlin, reports indicate the murder highlights the risks of speaking out against President Vladimir Putin.

The assailants, apparently driving by in a white car, sped away after the shooting. Investigators are combing through surveillance video and say, "There is no doubt this crime was carefully planned."

Nemtsov was one of Putin`s most vocal critics, speaking harshly about violations of human rights. In a 2014 interview with CNN`s Anthony Bourdain, Nemtsov warned of corruption.

"This is a country of corruption and if you have business you are in a very unsafe situation," Nemtsov said.