Almost half of the Islamic terrorists who hijacked planes in the United States on September 11, 2001, overstayed their visas due to an immigration loophole that remains open, used by more than half a million foreign nationals every year.
Nineteen terrorists were directly involved with the 9/11 attacks that murdered nearly 3,000 Americans and injured more than 6,000 others. All 19 arrived in the U.S. legally, with 16 obtaining tourist visas and three others obtaining business and student visas.
Seven of the 19 terrorists overstayed their visas, either before the attacks or at the time of the attacks. None were deported, due to a lack of interior immigration enforcement.
Those seven terrorist visa overstays include:
Hani Hasan Hanjour of Saudi Arabia Nawaf al-Hamzi of Saudi Arabia Mohamed Atta of Egypt Satam al-Suqami of Saudi Arabia Waleed al-Shehri of Saudi Arabia Marwan al-Shehhi of the United Arab Emirates Ahmed al-Ghamdi of