Friends of missing American questioned using polygraph by police as search goes on for 25 year old student last seen early Sunday.
A detained opposition activist accused of inciting mass unrest aimed at overthrowing President Putin has been additionally charged with the armed robbery.
Nicknamed 'The Werewolf', police probe new deaths 'in vengeance for his fears wife cheated on him'.
Vladimir Putin's supporters beaten in Siberian region.
State investigators examining whether 'The Werewolf' had 'dozens' more victims in Siberia and Russian Far East.
Stunning new Danish-designed buildings will offer new hope to orphans and their adoptive families.
Fresh water supply crisis looms in parts of Siberia as critics accuse hydroelectric firm of 'excessive drainage' from lake.
Predators seek food in villages all around Siberia as climate expert warns of worse fires each year due to soaring rise in temperatures, 10C above average.
All production of uranium across Russia will be in the closed Siberian town of Seversk by 2016.