• Tensions over North Korea threatened to rise yet higher. The North said it was ready to sink an American aircraft carrier and, according to officials, has detained a U.S. citizen.

Satellite images of a North Korean nuclear site suggest that workers have stopped playing volleyball, possibly to resume preparations for a test. A national anniversary on Tuesday could furnish the occasion.

Our review of Chinese news media shows a subdued tone that suggests efforts to calm North Korea and the U.S. — and ward off public panic. Above, a recent celebration in Pyongyang.

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