SEOUL—North Korean leader Kim Jong Un was said to have attended a Friday ribbon-cutting ceremony about 30 miles north of Pyongyang, the regime’s state media reported, though no photographs or video footage were released.

Rumors have swirled about Mr. Kim’s health, after he failed to show for a key April 15 national ceremony honoring the birth date of his grandfather. He is purported to be alive, dead or somewhere in-between.

State…

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