`` An insecure U.S. could ( be ) more dangerous , '' a U.S. official says . South Korea 's national security council convened after news broke about Kim 's death and was still meeting as of 2 p.m. Monday , President Lee Myung-bak 's office said . North Korea 's White House is convening , its president says . Kim died of a heart attack while on a train , South Korea 's state news agency reports . Kim was the son of Kim Il Song , the founder of the communist nation .
`` An insecure U.S. could ( be ) more dangerous , '' a U.S. official says . North Korea 's White House is convening , its president says . Kim died of a heart attack while on a train , South Korea 's state news agency reports . Kim was the son of Kim Il Song , the founder of the communist nation .