Seoul, June 4 -- North Korean leader Kim Jong-un visited a newly launched nuclear material production facility on Wednesday, Yonhap News Agency reported, citing the Korean Central News Agency.

As per the report by Yonhap, Kim Jong Un vowed to "exponentially" strengthen the country's nuclear arsenal, as he visited the facility accompanied by key party officials.

The location or other details, however, were not mentioned.

Presently, it is believed that North Korea houses uranium enrichment facilities at three locations--Yongbyon, Kusong and Kangson. It remains unclear whether there is a fourth location.

Citing the KCNA report, Yonhap mentioned that Kim claimed that the country's "weapons-grade nuclear material production capacity more t...