Where did the terrorists who attacked the twin towers come from?

The terrorists who attacked the Twin Towers on September 11, 2001, were primarily members of al-Qaeda, a militant Islamist group. Most of the 19 hijackers were from Saudi Arabia, while others were from the United Arab Emirates, Egypt, and Lebanon. They were motivated by a range of factors, including opposition to U.S. foreign policy in the Middle East and support for Israel. The attacks were planned and executed as part of al-Qaeda's broader agenda against what they viewed as Western imperialism and influence in the region.