At least a dozen people were killed and many more remained missing on Saturday after part of a highway bridge collapsed Friday night amid heavy rain in western China. It was the second deadly episode in the country in less than three months involving the failure of a stretch of highway.

       State media reported early Saturday afternoon that 12 bodies and seven vehicles had been found, and that one person had been rescued. Eighteen vehicles and 31 people were still missing.

       A photograph released by the official Xinhua news agency on Saturday showed how a bridge in one direction of the highway had snapped. A section of it was folded downward, nearly perpendicular, into a churning, muddy river. A separate bridge that supported traffic in the other direction remained standing.

       The head of the Ministry of Emergency Management, Wang Xiangxi, went to the site Saturday morning and was overseeing a rescue effort that involved 869 people, 93 vehicles, 41 drones, 20 boats and a sonar system, according to the authorities.

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       Both Xi Jinping, China’s top leader, and Premier Li Qiang, the country’s second-highest leader, ordered all-out rescue efforts.

       They had issued similar instructions after the previous disaster, which occurred on May 1 also amid heavy rain. At least 48 people died after a section of expressway running along the side of a hill in southeastern China gave way, apparently because a landslide began underneath it. Mr. Xi had ordered that local governments across China pay more attention to identifying and dealing with such risks.

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