Ban on travel abroad for officials

Yangzhou via WikipediaThe central government as banned all trips abroad for China's officials, the Dutch website Gele Draak reports. The site reports that a Chinese delegation of 32 officials from Yangzhou, supposed to attend a conference on water and environment in Rotterdam and to visit the Dutch city of Breda in June, have cancelled their participation.
The ban has not yet been reported by other sources I have seen. It seems to be a general ban, Yangzhou is about 2,000 kilometers away from the earthquake in Sichuan.
The Dutch conference has now been postphoned and will be organized on another moment. The organizers said they were disappointed.

Update: I got an informal confirmation of the nationwide ban on travel. The main explanation is that China wants to save costs, now it needs all its resources for Sichuan. An official announcement is expected later. So, a few more trips might be cancelled and organizers worldwide might have to revise their plans. Anyway, getting 32 officials from a little town in China seems a bit crazy anyway, even if that would include their concubines.
The government order has been classified as "secret", explaining why we have to tell you.