The government has announced a decision has been made to postpone the summit to a later date, in effect cancelling it.
Prime Minister Abhisit Vejjajiva declared a state of emergency in Pattaya and Chon Buri, partly to facilitate the departure of Asean VIP guests. He told a press conference Asean leaders and their dialogue partners understand the need to postpone the summit and support government action regarding Saturday’s incidents. continue
http://www.nationmultimedia.com/2009/04/11/politics/politics_30100256.php