(CNN) -- Russian police detained almost 400 people on Sunday after protests over a recent stabbing death turned violent, state news reported.
Both the stabbing death and the protests took place in southern Moscow.
The latter targeted a vegetable market, where many migrants work, RIA Novosti reported.
The state-run Russian news agency said that protesters broke glass and set off smoke bombs.
It did not identify the 25-year-old man who was stabbed to death last week.
State-run Itar-Tass reported that many local residents blame migrant workers for the murder and rallied Sunday to demand that those responsible are punished.