Story highlights Protesters target a vegetable market; some 400 people are reported detained

A 25-year-old man was stabbed to death last week

Some residents in the area where the stabbing happened blame migrant workers

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.