At least four people died after an earthquake measuring 6.3 magnitude on the Richter scale hit China.The earthquake hit south-west China's Sichuan province, Xinhua reported Sunday. The quake struck at 4:55 p.m. Saturday, with its epicentre in Tagong town, according to the China Earthquake Networks Center.Six of the injured were in a critical condition, while five others suffered severe injuries. The remaining 43 people had minor injuries, according to the government.Two of the six reported earlier to be critically injured, died later, taking the toll up to four.Nineteen of the 43 slightly injured are students of an elementary school.