More than 1,200 people have been arrested in Russia one day after major riots in southern Moscow, the BBC reports.
The "pre-emptive" raid targeted migrants, Russian news agencies said.
Yesterday rioting erupted in Moscow after a migrant from the Caucasus was blamed for the murder of a young ethic Russia man.
Demonstrators, some chanting racist slogans, vandalised shops and smashed windows in sites known for employing migrant workers in the southern Biryulyovo area.
Several hundred residents protested peacefully, demanding justice over the killing, but a large group of young men overwhelmed the peaceful demonstration, setting fire to shopping centre and stormed a vegetable warehouse employing migrants.
Moscow police said several officers were wounded in the riots, around 380 people were detained and a criminal case was opened.