Workers erect steel fence in front of Sydney Opera House forecourt ahead of Forbes CEO conference in Sydney. Workers (R) erect a steel fence in front of the Sydney Opera House forecourt, ahead of the Forbes CEO conference scheduled to start Tuesday, in Sydney, August 29, 2005. Security at the landmark has heightened since the September 11, 2001 attacks on the U.S., with Prime Minister John Howard warning that the country, a staunch U.S. ally, is a terrorist target. REUTERS/Will Burgess