LONDON, England (CNN) -- Russian special forces carried out a "novel" attack to end the Moscow theatre hostage crisis -- but incurred a high death toll in its execution, a military expert says. About 750 people were saved in the dawn raid by Russian forces on Saturday, but 67 of the hostages died in the operation and a further 42 were taken to hospital, apparently suffering from gas inhalation. A sleeping gas was used to confuse and disarm the 50 Chechen rebel hostage-takers during the storming of the building, in which all of the 75 non-Russians and 25 children are...