BBC
October 14, 2013

The “preventative raid” targeted workers at a vegetable warehouse, which was attacked by demonstrators on Sunday, Russian news agencies reported.
Angry protesters overran the market searching for migrant workers.
The rioting began during a protest over the killing of an ethnic Russian man on Thursday, allegedly by a Muslim migrant from the North Caucasus.
Ethnic Russian Yegor Shcherbakov, 25, was killed in front of his girlfriend in the capital’s Biryulyovo district.

Media said the image suggested the man was of “non-Slavic appearance”, leading nationalists to conclude the killer was a Muslim migrant from the Russian North Caucasus.