North Korea may be preparing to test an "even more capable" intercontinental ballistic missile (ICBM) -- one that may "enhance" the DPRK's ability to threaten the U.S., according to congressional testimony by one of Washington's top military commanders.

In a written statement submitted to a U.S. House panel overseeing the country's missile defense, General Terrence O'Shaughnessy, the commander of U.S. Northern Command and North American Aerospace Defense Command, warned that North Korea's recent short-range missile tests -- along with DPRK leader Kim Jong Un's own words -- may be signs that Pyongyang's ability to threaten the U.S. has grown.