Kim Jong-un touring his space agency back in April – pictured are several men holding briefcases (Picture: Pen News) Pyongyang has been rocked by a bomb attack, sources within the country revealed, after Kim Jong-un beefed up his security with a phalanx of briefcase-wielding bodyguards. The explosion in the North Korean capital was disclosed to The Dong-a Ilbo, a newspaper in South Korea, by a source citing testimony from local residents. The so…