This is a summary of what investigators have learned about the hijackers who attacked New York and Washington on September 11:
Mohamed Atta, aged 33, from Egypt
Atta, believed to have piloted the flight, had spent four months training on small planes. In the 1990s, he lived in Daytona Beach, Florida, where he returned in May – with another alleged hijacker, Marwan al-Shehhi, a former flatmate from his university days in Hamburg. Atta and another suspect, Abdulaziz Alomari, were filmed at Portland airport before leaving for Boston on 11 September. His father says he may have been murdered and had his documents stolen.
Waleed al-Shehri, age unknown, Saudi Arabia
Al-Shehri and his brother, Wail, are believed to have fought in Afghanistan. But the New York Times reported the real al-Shehri is abroad. Al-Shehri learned to fly at the Embry-Riddle university in Florida.
Wail al-Shehri, 28, Saudi Arabia
The FBI says he sat next to his brother, Waleed, on Flight 11. He was also believed to have been a trained pilot. His father says he is alive.
Abdulaziz al-Omari, 29, Saudi Arabia
Al-Omari was on the passenger list next to Mohamed Atta. But there have been reports that the real Al-Omari, a pilot, is alive in Saudi Arabia.
Satam al-Suqami, 25, Saudi Arabia
Suqami’s passport was discovered in the rubble of the World Trade Centre. Along with Ahmed al-Ghamdi, he has been tied by the FBI to a former cab driver now on trial for a series of foiled bombings in Jordan.
Ahmed al-Ghamdi, 21, Saudi Arabia
Al-Ghamdi had a Florida ID card. He went to Chechnya two years ago from Saudi Arabia. The day before the attacks, he left the Philippines.
Marwan al-Shehhi, 23, United Arab Emirates
One of the three alleged hijackers to have attended university in Hamburg, al-Shehhi was seen drinking in a Florida bar four days before the attacks. He went to flying school in Florida with Mohamed Atta.
Fayez Ahmed, 28
Thought to have lived in Delray Beach, Florida, Ahmed held a pilot’s licence and was listed as having trained in Tulsa, Oklahoma, although the school had no record of him attending.
Mohald al-Shehri, 28
Al-Shehri, a qualified pilot, lived in Vero Beach, Florida, and records show he attended the FlightSafety academy.
Hamza al-Ghamdi, 20
Al-Ghamdi lived for several months at Delray Racquet Club in Delray Beach, Florida, with Ahmed al-Nami and Saeed al-Ghamdi, his cousin. He was on a tourist visa and is believed to have been a pilot.
Al-Midhar flew a Cessna in San Diego last year. His English skills did not meet federal standards and the classes were stopped after two flights. Saudi officials say that he may be alive. He has been on a CIA watch list since January last year.
Nawaq al-Hamzi, 25, Saudi Arabia
Al-Hamzi is thought to have stayed near Washington with Ziad Jarrah on September 1. Recently, he used an address in Florida, near an apartment complex used by two other hijackers.
Hani Hanjour, mid-20s, Saudi Arabia
Hanjour obtained a pilot’s licence in April 1999 with a rating to fly commercial jets. He is believed to have flown over Washington airspace on three occasions in a Cessna shortly before the attacks.
Salem al-Hamzi, 21, Saudi Arabia
Al-Hamzi was listed on a database in the Federal Aviation Administration’s airman directory and is known to have left for Chechnya 18 months ago.
Moqed ordered his ticket via the internet through the same frequent flier number as Khalid al-Midhar and paid for it in cash.
Saeed al-Ghamdi, age unknown, Saudi Arabia
This name was probably taken from an innocent Saudi pilot who used to work at Logan Airport in Boston and had his passport stolen. A man using this name was living at the Delray Racquet Club and was listed by the FBI as having an address at the FlightSafety academy. Students there claim not to have known him. He is believed to have visited the Philippines at least 15 times in the last year.
Ziad Jarrah, 27, Lebanon
Paid for three nights at the Pin Del Motel in Laurel, outside Washington, on August 27, but left the next day. He gave a Florida address. Studied in Germany from 1996 to 1999 when he moved to Florida. His father sent money to start a part-time pilot’s course in Miami.
Ahmed al-Nami, 23, Saudi Arabia
Last December, al-Nami was living in Delray Beach, Florida, with Saeed al-Ghamdi. His father said he dropped out of college and disappeared 15 months ago. A resident of the Delray Racquet Club complex said she thought he was drug dealer because she saw men there at all hours carrying bags.
Ahmed al-Haznawi, 20
Al-Haznawi entered the US on a Saudi passport and lived in Lauderdale-by-the-Sea with Ziad Jarrah. He also used a Delray Beach address.