It imposed the measure "having verified that ... diplomatic personnel have carried out activities incompatible with their official duties," it added, but did not give further details.
The ministry said the decision was also related to North Korea's "continuous violations" of UN Security Council resolutions on non-proliferation -- which it said put regional and global peace and security at risk.
In September, Peru also expelled North Korean ambassador Kim Hak-Chol in response to ongoing efforts by Pyongyang to build up its nuclear force -- having already halved the number of embassy diplomats to three in March.
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