In the early 1990s bin Laden and his al-Qaeda network began to formulate an agenda of violent struggle against the threat of U.S. dominance in the Muslim world. Bin Laden publicly praised other groups’ attacks on Americans, including the 1993 bombing of the World Trade Center in New York. In 1994, as bin Laden expanded his group’s infrastructure in Sudan and trained Islamic militants to participate in conflicts around the world, Saudi Arabia revoked his citizenship and froze his assets, forcing him to rely on outside sources for funding.