BEIJING, April 25 (Reuters) - China reported 13 new COVID-19 cases on April 24, up from nine cases a day earlier, the national health authority said on Sunday.

All of the new cases were imported infections originating from overseas, the National Health Commission said in a statement. The number of new asymptomatic cases, which China does not classify as confirmed cases, rose to 14 from 12 a day earlier.

The total number of confirmed COVID-19 cases in mainland China stands at 90,588, while the death toll remains unchanged at 4,636.

(Reporting by Yew Lun Tian; Editing by Dan Grebler)