Russian police have arrested more than 1,000 migrants in a neighbourhood in Moscow following riots.
Rioting erupted in the area yesterday over a fatal stabbing of a Russian that many residents blame on a man from the Caucasus region.
An advocacy group warned migrants from the mainly Muslim Caucasus and Central Asia of an increased risk of attacks after the worst ethnic disturbance in the Russian capital in three years.
About 1,200 people were detained at a wholesale vegetable market that had been stormed last night by rioters after a protest over the stabbing to death of an ethnic Russian man, police spokesman Alexei Shapkin said.
The detainees were taken to police stations and police will seek to determine whether they were involved in any crimes, he said.
Televised footage showed detainees standing against walls or lined up in front of camouflage-clad police.
Residents had previously rallied in the Biryulyovo district to demand police find the killer of 25-year-old Yegor Shcherbakov and take more action to prevent crimes by migrants.
Mr Shapkin said police found a car at a warehouse with three pneumatic pistols, two knives and a baseball bat inside.
Yesterday, a mob in the southern neighbourhood smashed shop and vending stalls and fought with police.
Police arrested at least 380 people as they struggled to quell the violence.