MOSCOW, 4 March. /TASS/. Russian President Vladimir Putin has asked the law enforcement agencies to make the country secure against what he described as disgrace of political murders.

"The most serious attention should be paid to high-profile crimes, including those having political motives," Putin told the Interior Ministry’s board meeting on Wednesday.

"Russia should be made secure at last from the disgrace and tragedies of the kind we all experienced and witnessed just recently. I am referring to the daring killing of Boris Nemtsov in the very heart of our capital city," Putin said.

Nemtsov, a co-leader of the RPR-Parnas party, was shot and killed on a bridge in central Moscow at a blank-point range several hundred meters away from the Kremlin minutes before the midnight of Friday, February 27. Nemtsov was buried at Moscow’s Troyekurovo cemetery on Tuesday.

The investigators are pursuing several lines of inquiry, including a contract killing.

The car sought in connection with the murder of Russian opposition leader Boris Nemtsov belongs to a federal state unitary enterprise (FSUE) providing services to the Finance Ministry, Goznak, the Russian state body that prints banknotes, and other agencies, the Finance Ministry said earlier on Wednesday.

Head of the Russian Security Service Alexander Bortnikov on Wednesday announced that there are suspects in the investigation into the murder of prominent Russian opposition figure Boris Nemtsov.