China's Sichuan province Tuesday faced a threat of an aftershock measuring up to 7 on the Richter scale, one week after a massive earthquake in the region.

The seismological bureau in Chengdu said a 6 to 7 Richter aftershock could rock the Wenchuan epicenter area and urged the local government and people to be prepared for emergencies, the state-run Xinhua news agency reported.

The official estimate of the death toll from the May 12 earthquake stood at 34,073 as of noon Monday and the number of injured was 245,108. China has mounted a massive relief effort which includes tens of thousands of rescue teams assisted by more than 110,000 people, including police officers and soldiers.

After approving foreign rescue teams -- including teams from Japan, Russia, South Korea and Singapore -- to aid in its relief effort, China Monday agreed to receive foreign medical teams, Xinhua reported.

Considering the need of the current relief work, China Red Cross is authorized to accept medical teams from foreign countries to come to assist medical and treatment work, a foreign ministry spokesman said.

The State Electricity Regulatory Commission said at least some power has been restored to but three counties in quake-stricken areas.

China Monday began a 3-day national mourning period for the dead.

Premier Wen Jiabao, who has been overseeing the relief effort, has ordered soldiers to reach all quake-affected villages in 24 hours. He also called for stepped-up epidemic prevention, Xinhua reported.

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