At least four cities in China, in Northwest China's Qinghai Province, Southwest China's Sichuan and Yunnan Province, and North China's Shaanxi Province, were jolted by earthquakes in 24 hours.<br />''<br />''At least three deaths were reported so far as reported by state media. The 6.4 magnitude quake in Yunnan's Yangbi county, with a focal depth of eight kilometers, caused three deaths and injured 27 on Saturday morning.<br />''<br />''No casualties were reported in earthquakes that occurred in the other three regions yet.<br />''<br />''Hours after the 6.4 magnitude quake in Yunnan, Maduo county of Qinghai reported an earthquake with a 7.4 magnitude, regarded as the biggest earthquake in China after the Wenchuan earthquake of 8.2 magnitude in Southwest China's Sichuan Province in 2008.<br />''<br />''The Maduo county in Qinghai reported a total of 104 aftershocks and 40 earthquakes of magnitude 3 and above.<br />''<br />''The strong earthquakes in Qinghai collapsed one expressway and a river bridge.<br />''<br />''Some other roads were severely deformed and cracked. Affected by the earthquake, several railway lines in Yunnan Province suspended operation. <br />''<br />''<span style="color: #222222;">A magnitude 3.4 earthquake also occurred in Xuyong county of Sichuan Province early Saturday and a magnitude 3.6 earthquake occurred in Shangnan county, North China's Shaanxi Province on Saturday morning.</span><br />