Russian President Dmitry Medvedev said Monday that all rioters involved in the Dec. 10 protest on Manezh Square near the Kremlin will be punished.
"Everything is under control on Manezh Square and in the country. All the inciters will be brought to justice. All of them, without question," Medvedev wrote in his Twitter account.
Also on Monday, Moscow police told local media that they were looking for the killers of Pavel Kazakov, 19, who died of stab wounds in hospital.
On Saturday, over 2,000 football fans clashed with police on Manezh Square. They threw metal fences, bottles and flares at police, damaging several street lamps and a Christmas tree on the square.
About 65 rioters were detained, Moscow city police spokesman Viktor Biryukov told Interfax news agency.
The fans were protesting the death of Yegor Sviridov, a 28-year-old supporter of the Spartak club who was killed by four shots fired from a rubber-bullet pistol during a mass brawl between football fans last Monday. Police have detained a suspect from the North Caucasus republic of Kabardino-Balkar.