The presence of Ingush raiders could threaten to inflame long-standing tensions between them and ethnic Ossetians, who are the majority in the republic of North Ossetia where the school was seized.
The Ingush and Ossetians fought a 10-day war in 1992 over rights to land as Ingush tried to return to their homes half a century after being sent into exile with the Chechens under Soviet dictator Josef Stalin.
While most of the hostage takers were from Chechnya, eight were ethnic Ingush .
He also deported the entire Ingush population and gave their land to Ossetians.
They believe there was one Korean, one Russian national, the rest were made up of Ingush , one or two northern Ossetians, and the remainder were Chechen.
The author does not include Nart sagas from other ethnic groups among whom the sagas are strongly represented, namely the Ossetes, Balkars and Karachays, nor those weakly represented, such as the Ingush , Chechens or Svans.
Ossetians say the end of the mourning period could herald an outbreak of inter-ethnic violence among Ossetians and ethnic Ingush who live there.
The volatile relationship between North Ossetians and the Ingush is just one of many rifts between ethnic groups in the Caucasus Mountains region that have made southern Russia a seedbed for violence for so many years.
Three security force officers were wounded in the operation to capture Sambiyev in the Ingush city of Nazran.
Police discovered and destroyed the shells on Saturday near the Ingush capital Magas, the Interfax-Yug news agency quoted the official as saying.