PBOC emailed Fed on July 27

Reuters earlier reported that the PBOC asked the Fed for 'urgent assistance' and wanted to draw on the Fed's experience in dealing with the 1987 Black Monday crash.

The PBOC was particularly interested in the details of the Fed's use of repurchase agreements to temporarily inject cash into the U.S. banking system in 1987.

The Fed responded by sending publicly-available data on how they dealt with the panic that day.

In other China news, the PBOC is one Weibo emphasizing that Zhou's weekend comments weren't intended to encourage Chinese savers to invest in stocks.