There have been no reports of casualties and building collapses after a moderate earthquake hit Xigaze Prefecture of southwest China's Tibet Autonomous Region early Sunday morning, local government sources said.

The quake measuring 5.6 on the Richter scale struck an area bordering the Ngamring and Saga counties at 4:08 a.m., according to the National Seismological Network.

The epicenter was detected as 29.4 degrees north latitude and 86.1 degrees east longitude, with a depth of about 33 km.

Puqiong, director of the general office of the Ngamring county government, told Xinhua by phone that the government hasn't received any reports of casualties or building collapses.

But he said cracks have been found in some houses in Qera town where the quake was strongly felt.

He said the county government has sent working groups to the quake-hit areas.