US warns N. Korea of 'massive military response' after nuke test

The United States warned it could launch a "massive military response" to any threats from North Korea following Pyongyang's provocative detonation of what it claimed was a miniaturized hydrogen bomb.Defense Secretary Jim Mattis spoke out on Sunday after North Korea carried out an unexpectedly strong nuclear test, more powerful than the bomb that levelled Hiroshima in 1945.President Donald Trump called an emergency meeting of his national security advisers and had his second telephone call of th