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Russian police detained hundreds of nationalist youths on Tuesday who gathered to protest over the killing of an ethnic Russian in southern Moscow, hours after authorities arrested a migrant laborer suspected of the slaying, Reuters reported. 

The killing of Yegor Shcherbakov, 25, unleashed earlier this week the worst race riots Moscow has seen in three years and nationalists threatened further protests in areas populated by migrant workers from ex-Soviet Central Asia and Caucasus states.

Advocacy groups warned migrants of a high risk of violence as crowds of Muslims celebrated the Islamic holiday of Eid al-Adha, and a heavy police presence was seen in the capital.

Police said they had detained a native of the mostly Muslim state of Azerbaijan, Orhan Zeynalov, who is suspected of fatally stabbing Shcherbakov in front of his girlfriend while they were walking home on Thursday night.

The murder triggered the riots in Moscow's southern Biryulyovo district, where Shcherbakov was attacked.

Police said Zeynalov resisted special forces when they tried to detain him in Kolomna, a small town outside Moscow, Russian news agencies reported.

Tensions simmer in Moscow between disenchanted ethnic Russian youths and labor migrants mostly from predominantly Muslim ex-Soviet states.

Hundreds of nationalists gathered near a shopping centre in southern Moscow, Russian wires said, to protest against Shcherbakov's killing in what was promoted online by nationalists as an "Answer to Eid al-Adha."

City police official Oleg Sigunov was quoted by RIA as saying that 276 young people had been detained on their way to the protest.

Earlier in the day, police set up barriers and metal detectors outside Moscow's main mosque. Ethnic tension is often higher during the Islamic holiday because crowds spill out into the streets around the city's few mosques.