Nuclear-armed North Korea fired off "multiple" ballistic missiles on Wednesday for the second time in a week, just days after it publicly revealed one of its uranium enrichment facilities.

The Defense Ministry in Tokyo said the latest launches, which came between 6:53 a.m. and 7:23 a.m., saw the missiles splash down into waters outside Japan's exclusive economic zone.

The ministry, which usually details the trajectory of such launches, did not offer a map of the firings or any information on the distance it estimated the missiles had traveled.