Two men suspected of involvement in the murder of Russian opposition leader Boris Nemtsov have been arrested by the FSB secret service , it was announced today . The announcement came a week after the 55-year-old foe of Vladimir Putin was gunned down on a bridge close to the Kremlin , where he was walking with his 23-year-old girlfriend , Ukrainian model Anna Duritskaya . FSB head Alexander Bortnikov said in a televised statement : 'As a result of the work done , we have detained today two people suspected of committing this crime - those are Anzor Gubashev and Zaur Dadayev . Scroll down for video . Nemtsov ( left ) and his 23-year-old model girlfriend , Anna Duritskaya ( right ) were walking through Moscow when he was shot four times . 'We have reported it to the president . ' He stressed the Lubyanka was continuing 'necessary operative and investigative work ' on the case . Bortnikov did not immediately give details of their suspected role in the brutal killing , but TASS news agency claimed both were 'suspected of murdering Boris Nemtsov ' . Nemtsov was killed as he was preparing a report alleging the Kremlin was deeply involved in the bloody war in eastern Ukraine . Fellow opposition leaders have vowed to ensure his report is published . The two men held by the FSB are understood to be from the Caucasus region in southern Russia . They were evidently detained from evidence found in the getaway car , and through surveillance of telephone calls . But the investigation is still seeking those who ordered the politician 's killing . Earlier this week Russian President Vladimir Putin called for an end to the 'shame ' of political killings which have plagued the Kremlin in recent years . The Kremlin has denied any involvement , saying that the killing was a 'provocation ' designed to discredit Putin and strengthen his opponents . He was the most prominent opposition figure to be killed in Russia during Putin 's 15-year rule . News of the arrest comes as president Vladimir Putin earlier this week demanded an end to 'shameful ' political assassinations in the wake of the shooting . But Nemtsov 's friends say the Kremlin is to blame for fomenting an atmosphere of hatred towards its opponents . In a speech with officials from the interior ministry , Putin said : 'The most serious attention should be paid to high-profile crimes , including the ones with a political subtext . 'Russia should be devoid at last of the kind of shame and tragedies that we have recently endured and seen . Nemtsov 's mother Dina Eidman , his secretary Inna Krolyova and daughter Dina ( from left to right ) pay their last respects at a ceremony for Nemtsov . The body of Boris Nemtsov lies in a body bag in central Moscow in the hours after he was gunned down . Emergency services clear the politician 's body from the scene where he was killed on February 28 . ' I mean the murder , the audacious murder of Boris Nemtsov right in the centre of the capital . ' Law enforcement officials have said one lead they were exploring was that the killing was linked to Nemtsov 's personal life or business dealings . Earlier on Wednesday , the director of Russia 's Federal Security Service said that an investigation had identified several suspects , without giving details . Thousands of Russians yesterday paid their final respects to Nemtsov when he was laid to rest in the capital . The politician 's mother Dina , 87 , and four children laid him to rest , with ex-UK prime minister Sir John Major leading Western mourners attending his funeral .
Russian security service has arrested two suspects in political shooting . The men were detained at a Moscow airport on Tuesday and are being questioned by the Federal Security Service, Russia's top domestic intelligence agency.