North Korea on Monday extended the window for its planned rocket launch by one week due to technical problems but stressed it was pushing on with the mission in the face of international condemnation.

A day after announcing a review of the original December 10-22 launch schedule, the Korean Committee of Space Technology said it was extending the window to December 29.

In a statement carried by the official Korean Central News Agency, the committee said scientists and technicians were still “pushing forward” with preparations for the mission.