U.N. Secretary-General Ban Ki-moon "remains deeply concerned about escalating tensions on the Korean peninsula."
His comment on April 5 came following a warning by North Korea that it could not guarantee the safety of diplomats after April 10 while also asking embassies to consider moving staff out of the country.
Also on April 5, South Korean media reported that North Korea had placed two of its intermediate-range missiles on mobile launchers and hidden them on the east coast of the country in a move that could threaten Japan or U.S. Pacific bases.
The report could not be confirmed, but White House spokesman Jay Carney told reporters that based on past behavior, "we would not be surprised" to see North Korea conduct another missile test.
Based on reporting by Reuters and AP