The students from the former Soviet republic in Central Asia were beaten and robbed Wednesday evening in a dormitory of the State University of Management by a group led by a police officer.
"A second suspect in the assault has been detained," an official at the Moscow City Prosecutor's Office said without giving any more details.
Prosecutors said earlier that the first police officer, 27, would be charged with robbery and hooliganism, and that an investigation had been launched to catch his accomplices. The case is being overseen personally by Moscow's chief prosecutor.
The attack took place at around 8 p.m. Moscow time (4 p.m. GMT) Wednesday, when a man dressed in civilian clothes knocked on the door of a student room at the dormitory in southeast Moscow saying he was a police officer. When a student opened the door, six more men in plainclothes burst in.
"They beat the students with an iron wrench and belts, and kicked them," prosecutors said. "One of the students dropped his mobile phone, and the assailants grabbed it and left."
The assault is the latest in a series of attacks on foreigners in Moscow. In a murder that shocked the country, Vagan Abramyants, a 17-year-old Armenian student at the State University of Management, was stabbed to death on the platform of Pushkinskaya metro station in central Moscow at about 5 p.m. April 22.
Prosecutors said these crimes were not being considered as racially motivated.
