North Korea missile launch fails

   A North Korean missile launch has failed, South Korean defence officials say, but it is unclear how many were fired or what exactly was being tested.

  The US military said it detected a missile which appeared to explode within seconds of being launched.
North Korea is banned from any missile or nuclear tests by the United Nations.
  However, it has conducted such tests with increasing frequency and experts say this could lead to advances in its missile technology.
  Earlier this month, the North fired four missiles that flew about 1,000km landing in Japanese waters.