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Two men have been detained over the murder of Russian opposition politician Boris Nemtsov, the head of the Federal Security Service (FSB) has announced, the BBC reported.

Anzor Gubashev and Zaur Dadayev were detained on Saturday, FSB director Alexander Bortnikov said, speaking on national television.

President Vladimir Putin has been informed of their detention, he added.

The murder last month of the veteran liberal politician, on a bridge within sight of the Kremlin, shocked Russia.

The former deputy prime minister, 55, was shot in the back four times on the night of 27 February as he was walking on the street with his girlfriend. He was buried in Moscow on Tuesday.

Mr Bortnikov gave no details of how and where the suspects were detained, in the brief statement carried by Russia's state-owned Channel One, but he did say the investigation was continuing.

Mr Bortnikov also told Russian news agencies that the suspects were both from the Caucasus region.

A source said to be familiar with the investigation told Russia's Interfax news agency that the two detainees were suspected of carrying out the killing.

The car allegedly used by the suspects was found and evidence gathered in the vehicle was used along with phone records to indentify the suspects, the source said.