Hacker Attack on Hong Kong Exchange Website Triggers Halts

Hong Kong Exchanges & Clearing Ltd., the worlds biggest bourse operator by market value, said it suspended trading for companies including HSBC Holdings Plc after its website was hacked.

Source:
http://www.businessweek.com/news/2011-08-10/hacker-attack-on-hong-kong-exchange-website-triggers-halts.html