Japan began deploying sky marshals Thursday on board commercial flights to deter hijacking and terrorist attacks, according to sources.
The system is part of measures in a government action plan adopted Dec. 10 to prevent terrorists from entering Japan. The measure relating to sky marshals is the first step to be implemented under the package.
The plain-clothed marshals will board the plane with other passengers, but will be armed with guns loaded with special bullets that pose little risk to the aircraft, the sources said.