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SEOUL, Korea, Republic Of — North Korea caused a new stir Wednesday by publicizing a purported mock-up of a key part of a nuclear warhead, with leader Kim Jong Un saying his country has developed miniaturized atomic bombs that can be placed on missiles.

The North’s Rodong Sinmun newspaper carried photos on its front page showing Kim and nuclear scientists standing beside what outside analysts say appears to be a model warhead part — a small, silverish globe with a ballistic missile or a model ballistic missile in the background.

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The newspaper said Kim met his nuclear scientists for a briefing on the status of their work and declared he was greatly pleased that warheads had been standardized and miniaturized for use on ballistic missiles.

Information from secretive, authoritarian North Korea is often impossible to confirm and the country’s state media have a history of photo manipulations. But it was the first time the North has publicly displayed its purported nuclear designs, though it remains unclear whether the country has functioning warheads of that size or is simply trying to develop one.