A strong aftershock struck Sichuan Province, where a May earthquake killed almost 70,000 people, hours after the Olympic torch relay passed through the area.
Businesses, government offices, financial markets and schools were closed Wednesday in Hong Kong and Macau with the approach of a severe tropical storm.
The Japanese government that it would lodge a strong protest over the detention and beating of two Japanese journalists by security forces in the Chinese town of Kashgar on Monday.
President Pervez Musharraf delayed a visit to China for a day, the Foreign Ministry said, as opponents in the coalition government consulted over his possible impeachment.