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BEIJING — Mainland China’s new coronavirus cases doubled in 24 hours as the number of infected overseas travelers surged, and new asymptomatic infections more than quadrupled, pressuring authorities to tighten measures to stem local transmissions.

New confirmed cases rose to 62 on Tuesday from 32 a day earlier, the National Health Commission said, the highest since March 25. New imported infections accounted for 59 of the cases.

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The number of new asymptomatic cases more than quadrupled to 137, the health authority said on Wednesday, with incoming travelers accounting for 102.

Chinese authorities do not count asymptomatic cases as part of its tally of confirmed coronavirus infections until patients show symptoms such as a fever or a cough.

To stem infections from outside its borders, China has slashed the number of international flights and denied entry to virtually all foreigners.