MOSCOW , Russia ( CNN ) -- Russian investigators have no suspects in Monday 's killings of a prominent human rights lawyer and a journalist despite round-the-clock efforts to find the gunman , officials said Wednesday . A woman places flowers at the spot where Stanislav Markelov and Anastasiya Baburova were gunned down . Surveillance cameras recorded the murders but investigators could not make out the killer 's identity , Moscow Police Chief Vladimir Pronin told reporters , Russia 's Itar-Tass news agency reported . `` I can only state that it is a young man 180 centimeters ( 5 feet , 11 inches ) high with a slim body build , '' Pronin said . `` I can also state that there are no witnesses who saw the killer . '' He added police could not determine the killer 's ethnicity because a cap was over his eyes . The gunman killed attorney Stanislav Markelov , 34 , in front of an office in central Moscow , Russian media reported . Journalist Anastasia Baburova , 25 , who worked for the pro-democracy newspaper Novaya Gazeta , was also shot when she tried to intervene , and she died later in a hospital , Russian reports said . The killer stood behind them and aimed at the back of the head , Novaya Gazeta reported Wednesday . An estimated 3,000 people rallied in the Chechen capital of Grozny on Tuesday to protest the killings , Interfax reported . Reurters.com reported Tuesday hundreds of mourners demanded justice for the pair . `` I am deeply sorry and disgusted for Russia : how can you just shoot people down in broad daylight in the center of Moscow , '' said artist Alexandra Fomina , according to Reuters . `` Can we tolerate this much longer ? And will they catch anyone for this murder -- or will it be business as usual ? '' The funerals are scheduled for Friday . Markelov was known for his work on high-profile cases . He represented the family of a Chechen woman killed by a former Russian colonel in March 2000 , Russia 's Interfax news agency reported . Rebels seeking independence in Chechnya , an autonomous Russian republic , have long been fighting Russia . Markelov had held a news conference hours before his death opposing the early release of the colonel , Yury Budanov , who was freed after serving eight years of a 10-year sentence . Novaya Gazeta Editor-in-Chief Dmitry Muratov suggested Baburova was killed when she tried to apprehend the lawyer 's killer , but he also could not rule out the possibility that she herself was a target , Interfax reported . `` In fact , these two theories might well have something in common , '' Muratov told the news agency . Budanov has denied any involvement in the killings . `` Do you think I want to get another prison term after spending several days in freedom ? '' Budanov said in an interview with the Russian newspaper Komsomolskaya Pravda . He told the interviewer the crime was `` masterminded by those who want to drive a wedge between Russians and Chechens . ''
NEW : Chechens protest killings of lawyer and journalist in Moscow . Attorney Stanislav Markelov killed in front of an office in central Moscow . Journalist Anastasia Baburova shot when she tried to intervene . Markelov had opposed release of army colonel jailed for killing Chechen woman .