BEIJING (AP) — The U.S. Geological Survey says a magnitude-6.8 earthquake has rocked China's far western region of Xinjiang (shihn-jahng).

It's not clear if today's quake caused any damage or casualties. The China Earthquake Networks Center measured it at magnitude 7.

A police officer in the area says he felt tremors shaking the police station and ran outside.

USGS says the earthquake was centered 168 miles east-southeast of Hotan at a depth of 7.7 miles.