...and from Wiki...remember that the town of Beslan where the school massacre occurred was in North Ossetia:

"Riyadus Salihiin, later known as Islamic Brigade of Shaheeds, was the name of a shahid ('martyr') brigade of Chechen suicide attackers founded in 2002. Its amir (leader) was the Chechen commander Shamil Basayev, who died in July 2006.

It is claimed that Riyadus Salihiin was responsible for the 2002 Grozny truck bombing which killed 83 people and blew up the Chechen republic's government headquarters in the Grozny as well as the hostake-taking in a school in Beslan in 2004 which resulted in at least 386 casualties."

...another article:

"...It was also claimed that the SNO in Beslan was used by Ossetian militia as an internment camp for Ingush civilians during the 1992 Ossetian-Ingush conflict, and it was chosen as a target because of this connection. According to media reports, SNO was one of several buildings in which North Ossetians had held Ingush citizens, many of them women and children; the hostages sat on the gymnasium floor, deprived of food and water, just as the Ossetians would do in the 2004 siege, and several male hostages were hauled and executed outside. Beslan, like the nearby Mozdok, was also the site of an airfield used by the Russian military aviation for its operation in Chechnya since 1994.

The initial attack took place on September 1, the traditional start of the Russian school year, referred to as 'First September' or 'Day of Knowledge'. On this day, the children, accompanied by their parents and other relatives, attend ceremonies hosted by their school. Because of the pupils and family members attending the Day of Knowledge festivities, the number of people in the schools was considerably higher than usual for a normal school day." {small part of article}