The ministry said missiles, armoured vehicles, multiple rocket launchers and other weapons had been collected at the Mirim military airfield for a rehearsal, three months before the 70th anniversary of the founding of the North's ruling Workers Party on October 10.
In February, the North Korean party adopted a resolution calling for a "grand style" military parade in October and stressed the need for "cutting-edge" hardware to boost the nuclear-armed nation's fighting capacity.
The parades have been closely watched for glimpses of any new hardware that might signal a new step in the North's military development.
The 2013 event showed off a long-range ballistic missile, although experts debated whether it was a genuine working model or just a mock-up.
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