Chinese state media say a powerful aftershock has rattled the same area in southwestern China where an even stronger earthquake killed at least 28 people Saturday.

The Xinhua news agency says rescue workers are bringing water, food and tents Sunday to the quake-affected areas in Sichuan and Yunnan provinces.

Xinhua says Saturday's quake damaged or destroyed more than 100,000 homes and affected at least 600,000 people. Authorities say at least 238 people were hurt.

Heavy rain and poor communication have hampered rescue efforts and made it difficult to get complete casualty figures.

The center of Saturday's quake was located about 30 kilometers southeast of Panzhihua, near Sichuan's border with Yunnan province.

Chinese experts say the tremor had a magnitude of 6.1, but the U.S. Geological Survey measured the magnitude at 5.7.

On May 12, an earthquake in Sichuan province killed nearly 70,000 people and left millions more homeless. The Chinese government says it will cost nearly $150 billion* to rebuild areas devastated by that massive quake.

* Correcting typo which original stated $150,000, instead of $150 billion. 

Some information for this report was provided by AFP, AP and Reuters.