A crack, caused by an earthquake, is seen on a road in Jiuzhaigou in China's southwestern Sichuan province on August 9, 2017. At least 13 people were killed when a earthquake struck southwestern China, government sources said on August 9, but the toll was expected to climb as news trickles out of the remote mountainous region. Pic/AFP

The death toll from an earthquake measuring 7 on the Richter scale that struck China's Sichuan province on Tuesday night has risen to 13, an official said on Wednesday.