The suspect, Orkhan Zeinalov, has lived in Russia for more than 10 years and worked as a cabdriver, officials said.

The stabbing death of the 25-year-old ethnic Russian, Yegor Sherbakov, on Thursday ignited some of the worst anti-migrant violence in years. On Sunday, hundreds of people rampaged through a vegetable market in West Biryulyovo, the outlying district where the killing occurred, beating workers, destroying stalls and overturning cars. Rioters also clashed with the police.

Although hundreds were arrested after the disturbances, most were released. Meanwhile, the police have initiated a widespread crackdown on illegal immigrants, detaining more than 1,200.

In a statement announcing the arrest, officials said they were continuing to investigate apparent violations of immigration, labor and health laws and were considering bringing charges against the owners and operators of the vegetable market.

Vladimir Markin, a spokesman for the federal Investigative Committee, said investigators were working to gather more information about Mr. Zeinalov, who was arrested in Kolomna, a city about 70 miles southeast of Moscow.

“He has no permanent job and was a self-employed driver,” Mr. Markin said. “The investigators are gathering information about him, getting more accurate information on his police records and legality of his staying in Russia. It is known that he is hot-tempered, aggressive, abuses alcohol, has no permanent residence place in Moscow.” He said investigators were also questioning some relatives of Mr. Zeinalov in Russia.