Kuznetsov, 43, is "under the supervision of investigators, " Olig Troshin, a Penza prosecutor, told Itar-Tass.

CNN: Cult awaits end of days in cave after leader's arrest

"They are really few and far between, " says Alana Penza, director of the Institute for Sports Incidents.

BBC: Boston Marathon attack: How secure are marathons?

Four children are among 29 cult members holed up in a ravine in Russia's Penza region, where they apparently dug a cave.

CNN: Cult awaits end of days in cave after leader's arrest