Strong earthquake jolts southwest China; no word on damage

A strong earthquake has shaken China's Tibet region but there's no immediate word on damage or casualties.
The US Geological Survey says the 6.3 magnitude quake hit at a depth of about 10 kilometers about 58 kilometers northeast of Nyingchi.
The official Xinhua News Agency put the magnitude at 6.9 and says it struck at 6:34 a.m. Beijing time.