North Korea building collapse may reveal Achilles heel of Kim's regime

North Korean leader Kim Jong un (2nd L) visits the Taesongsan General Hospital in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang May 19, 2014. REUTERS/KCNA

SEOUL (Reuters) - It may have taken the collapse of an apartment block in an exclusive district of the North Korean capital to reveal the Achilles heel of young leader Kim Jong Un's secretive regime.

Last week's accident killed the families of people important enough for North Korea to issue an obsequious and unprecedented public apology in a bid to quell public anger, some analysts said.