It seems the US is not the only country setting off fireworks today. In an act of defiance on Independence Day, North Korea fired seven ballistic missiles off its eastern coast on Saturday, South Korean officials have announced. The launch, which came two days after the test-firing of four short-range missiles into the sea earlier this week, is a direct violation of UN sanctions. While a South Korean news service reported that the missiles fired were Scuds, government sources in Japan and South Korea say that they are Nodong missiles. Tensions are building in Japan, where officials said the launch was a "serious act of provocation against the security of neighboring countries."