Fifteen Arab countries will be represented in the conference, with Libya and Iraq the main Arab absentees. Riyadh announced in December it had recalled its ambassador to Libya and asked the Libyan ambassador to leave over an alleged plot by Tripoli to kill Crown Prince Abdullah bin Abdul Aziz.
The United Nations, European Union, Arab League and African Union will be represented, while countries such as the United States, Britain, France, China, Russia and Germany have said they will take part. Since May 2003, Saudi Arabia has been battling a wave of terror by presumed extremists who have killed more than 100 people in a spate of bombings and shootings.