There has been other earlier articles about the ethnicity of the terrorist hostage takers, (you may want to look at them), but here is the most current article I can find at the moment:
To: All
http://english.chosun.com/w21data/html/news/200409/200409070043.html?
"Ethnic Koreans Among Hostage Takers in Russia"
ARTICLE SNIPPET: "MOSCOW -- It has been confirmed that among the terrorists who took hostages at a school in North Ossetia, Russia, there were some Korean-Russians (Goryeo-in in Korean), greatly shocking expatriate Koreans residing in Russia and the Korean-Russian community. Anxiety is increasing among them that they may become victims of terrorism targeting non-Caucasians committed by skinheads and gangs.
“Although they were not Korean citizens, as they were ethnic Koreans, we are taking additional measures such as requesting their precise identity from authorities."
As both of the Russian words referring to a Korean-Russian and a [South/North] Korean is the same -- “Kareiski” -- and the foreign news agencies are translating that word into “Korean” in their news coverage, the embassy considers that more accurate and swift work of identity confirmation should be carried out, in order to prevent a plunge in the national image of Korea and Korean expatriates in Russia.
Earlier, Russian news agency RIA Novosti, quoting Sergei Fridinsky, deputy prosecutor general for the Southern Federal District, reported Monday afternoon (local time) that, “The attackers are composed of diverse nationalities and there were Chechens, Tatars, Kazakhs and even Koreans among the attackers.’"
Re: Koreans involved in school attack...
This seems very bizarre-