Russia sect held children underground

Four members of a reclusive Muslim sect in the Russian region of Tatarstan have been charged with cruelty against children for allegedly keeping them underground. Police found 27 children and 38 adults living in catacomb-like cells, dug on eight levels under the home of the sect's founder. It is not clear how long the children were kept underground. Al Jazeera's Melissa Chan reports from Moscow, the Russian capital.