A magnitude 6.6 earthquake with a depth of 10 kilometers (6 miles) struck southwest of Sichuan’s capital Chengdu on Monday, the United States Geological Survey (USGS) said.   

  The epicenter was about 43 kilometers (27 miles) southeast of Kangding, a city of about 100,000 people, according to the USGS.   

  More than a million residents in the surrounding areas were estimated to have experienced moderate tremors after the quake, which struck around 1pm local time, he added.   

  There were no immediate reports of casualties, according to state media CGTN.   

  In the past two decades, 25 other earthquakes of magnitude 5 or greater have occurred within 200 kilometers of Monday’s epicenter, according to the USGS.   

  A number of significant earthquakes have occurred along the Longmenshan Fault – which runs through the Sichuan Mountains – where the 2008 Sichuan earthquake struck.   

  The devastating 7.9-magnitude earthquake killed nearly 90,000 people and sent tremors through cities more than 900 miles away.   

  Last year, a magnitude 6.0 earthquake struck Sichuan, killing three people and injuring 60, according to state media at the time.   

  This is a developing story.