Hackers from North Korea are reported to have stolen a large cache of military documents from South Korea, including a plan to assassinate North Korea's leader Kim Jong‑un.
A South Korean MP told the BBC the information was from his country's defence ministry.
The compromised documents include wartime contingency plans drawn up by the US and South Korea.
They also include reports to the allies' senior commanders.
The South Korean defence ministry has so far refused to comment on the allegation.
Plans for the South's special forces were reportedly accessed, along with information on significant power plants and military facilities in the South.
The hack took place in September last year.
In May, South Korea said a large amount of data had been stolen and that North Korea may have instigated the cyber attack ‑ but gave no details of what was taken.
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