Strong aftershock hits southwest China

BEICHUAN, China (CNN) - A strong 6.0-magnitude aftershock shook the region near the border of Sichuan and Gansu provinces on Sunday, the U.S. Geological Survey said in a preliminary report.

Thousands of aftershocks have plagued the area since Monday's deadly 7.9-magnitude earthquake, whose epicenter was in Sichuan province.

The aftershock was 50 miles (81 km) west-southwest of Guangyuan in Sichuan province, at a depth of 6.2 miles (10 km), and occurred at 1:08 a.m. (1:08 p.m. ET) Sunday, the USGS said.

There was no immediate information on the impact of the quake.