New satellite imagery shows missile activity in North Korea.
The pictures are the latest indications Pyongyang could be continuing to develop long-range ballistic missiles.
The South Korean government is encouraging North Korea to stop delaying its "denuclearization."
In April, North Korea launched a rocket in a failed attempt to propel a satellite into space in defiance of a United Nations ban.
An analysis of the situation appears on the website of the US-Korea Institute at Johns Hopkins School of Advanced International Studies.
It says it remains unclear whether the north is preparing another rocket launch but it predicts the country may embark on new rocket and nuclear tests in the first half of next year.
James Steinberg, former US Deputy Secretary of State says, "From North Korea's active nuclear and missile program, to its military and political provocations against the South, uncertainty, unpredictability and danger hang like an ominous cloud. The political transition that has taken place in the past year in the North has not served to dispel these concerns. Hope for greater openness and reform is tempered by the continued reality of the brutally authoritarian system in the DPRK (Democratic People's Republic of Korea)."
Washington's most recent attempt to negotiate a freeze in North Korea's nuclear program in exchange for food aid collapsed with the April launch the United States regarded as a cover for testing ballistic missile technology.
WTTG FOX 5 & myfoxdc
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