Moscow police detain hundreds of migrants in marketplace raid MOSCOW, Aug. 7 (UPI) -- Some 400 Russian police officers raided a southeastern Moscow marketplace Wednesday, detaining more than 1,000 suspected migrants, officials said. The raid was part of the city's recent drive to "decriminalize" Moscow by checking markets and other sites that house and employ migrant workers, the official Russian news agency RIA Novosti reported. Last week city law enforcement officers detained thousands of people during a string of raids that followed a group attack on a policeman trying to arrest a rape suspect. Six people were arrested late Tuesday in a slave labor case involving some 700 Vietnamese nationals. The illegal migrants had been kept as slave garment workers at sites controlled by the six, authorities said. An International Migration Outlook report issued last year said Russia has the world's largest number of illegal immigrants, accounting for almost seven percent of its working population.