Jan. 7 killings in Yanggang province were apparently sparked by bullying of young conscript, sources said.
Kim's directive is sent to local party leaders, but may also be aimed at corruption in the military.
With high oil prices, North Koreans have again turned to the cheap but dirty fuel to power trucks.
Residents of the Rason Special Economic Zone (SEZ) are making a killing on hemp, a week strain of cannabis popular among some Chinese tourists.
Hundreds more were injured in the accident blamed on poor maintenance of rail lines.
Increased competition leads to pirate raids by military fishing boats and large civilian craft, sources say.
They are taking advantage of a growing demand for private home purchases, though the transactions are forbidden.
Players and coaches can earn much more than ordinary laborers sent abroad to work, sources say.
Resentment of Kim's rule prompts insults spoken widely in private, sources say.
Pyongyang pushes the people to collect the aluminum foil wrappers from cigarette packs as it seeks reflective camouflage.
Pyongyang makes vendors pay more, but gives them a day off to spend pursuing their ideological education.
The trips are officially a thank you for help with the floods, but many see the largesse as a propaganda tool.
Corruption in the police force and the courts is undermining public confidence in justice, sources say.
Buyers ignore offerings from the reclusive, sanctions-hit state in favor of products made in rival South Korea.
Traders in China are facing new restrictions after Thae Yong-ho leaves the country for South Korea.
Production in northern provinces exceeds goals, but the state takes it all.
Andrei Lankov sees limits to Beijing's willingness to pressure its ally Pyongyang, despite Chinese opposition to nuclear proliferation.