SEOUL (Reuters) - North Korea fired three short-range missiles from its east coast on Saturday, South Korea's Defense Ministry said, but the purpose of the launches was unknown. Launches by the North of short-term missiles are not uncommon, but the ministry would not speculate whether these latest launches were part of a test or training exercise. "North Korea fired short-range guided missiles twice in the morning and once in the afternoon off its east coast," an official at the South Korean Defense Ministry spokesman's office said by telephone. ...