Olympic bronze medallist Sanya Richards of the United States - who faded in the final won by Briton Christine Ohuruogu in Beijing - won the women's 400m in an overdue season's best of 49.74 secs, with Jamaica's Shericka Williams, second in Beijing, off the pace in fourth.

BBC: Bolt marks return with easy win

The data comes just a day after Beijing said that industrial production grew at its slowest pace in more than three years in August.

BBC: Chinese factory

Beijing is willing to play along, but at its own pace.

CNN: Money for Influence?