The hijack suspects

The United States Federal Bureau of Investigation has released the photos of the suspected hijackers of the four planes seized on 11 September.

Two planes crashed into the World Trade Center in New York, one into the Pentagon in Washington, and a fourth in rural Pennsylvania.

AMERICAN AIRLINES FLIGHT 11, which slammed into the North tower of the World Trade Center

Atta: Key link to other hijackers

Mohamed Atta, 33, possibly an Egyptian national, has emerged as a key link among the 19 men. He is believed to have been at the controls of Flight 11 when it hit the World Trade Center and has been linked to hijackers on two of the three other planes. Investigators say Atta was part of a terrorist cell in Hamburg, Germany, and received flight training in Florida.

Waleed M Alshehri, believed to be from Saudi Arabia, has used birth dates from 1974 to 1979 on various documents. Immediately after the attacks, he was identified as a Saudi commercial pilot who graduated in 1997 from Embry-Riddle Aeronautical University in Daytona Beach. But school officials said the FBI told them they had found the Waleed Alshehri who graduated from their school alive in Morocco.

Waleed Alshehri: Identity may be false

Wail M Alshehri, 33, may have lived in Hollywood, Florida, and Newton, Massachusetts.

Satam M A Al Suqami, 26, is possibly a Saudi national whose last known address was the United Arab Emirates. Florida records show he obtained a driver's license, listing a Boynton Beach address and reporting that his previous license was from Saudi Arabia.

Abdulaziz Alomari, believed to be a Saudi national, has used birth dates in 1972 and 1979 on various documents. Saudi Embassy officials in Washington have challenged his identity. They say a Saudi electrical engineer named Abdulaziz Alomari had his passport and other papers stolen in 1996 in Denver when he was a student and reported the theft to police there at the time.

UNITED AIRLINES FLIGHT 175, crashed into the South Tower of the World Trade Center

Al-Shehhi: Believed to be pilot of United Airlines 175

Marwan Al-Shehhi, 23, is a cousin or nephew of Atta and is believed to have been the pilot of Flight 175. He and Atta lived together during flight training in Florida and while students at the Technical University in Hamburg, Germany.

Fayez Rashid Ahmed Hassan Al Qadi Banihammad used a half-dozen different aliases. One alias, Fayez Ahmed, is a pilot who listed Spartan School of Aeronautics in Tulsa as his address on his license. School officials say they have no record that he attended and that he could have got the address from publications or the Internet.

Ahmed Alghamdi has been identified by witnesses as one of five hijackers who were at the Arlington Department of Motor Vehicles on 2 August. DMV officials said all five were there seeking Virginia identity cards. US officials say Alghamdi and three other hijackers have links to Bin Laden's al-Qaida network.

Hamza Alghamdi has used at least four aliases. Little more is known about him, although US officials have said he is one of four hijackers with known links to Bin Laden's network.

Mohand Alshehri The FBI lists three aliases he may have used.

AMERICAN AIRLINES FLIGHT 77, which crashed into the Pentagon

Hanjour: Suspected pilot of Flight 77

Hani Hanjour, 29, is believed to have been the pilot of Flight 77. According to public records and witnesses, Hanjour lived off and on in the United States for a decade before the attacks. Hanjour also was one of five hijackers identified by witnesses as being at the Arlington County, Virginia, Department of Motor Vehicles. Federal Aviation Administration records show a Hani Hanjour received a commercial pilot's license in 1999 and listing a post office box in Saudi Arabia as his address.

Majed Moqed, 24, is possibly a Saudi national. Moqed was one of five hijackers who went to the Arlington County, Virginia, Department of Motor Vehicles.

Khalid Almihdhar, 26, from Saudi Arabia, is one of two hijackers placed on a watch list this summer after US intelligence officials received information that they might have been meeting with suspected terrorists. By the time they were placed on the list, however, they were already in the United States. Almihdhar was shown on a surveillance videotape in Malaysia meeting with one of the suspects in the bombing of the destroyer USS Cole in Yemen.

Alhazmi: Car found after the attacks

Nawaf Alhazmi, believed to be from Saudi Arabia, is the other hijacker on the terrorist watch list before the attacks. A car registered to Alhazmi was found at Dulles International Airport the day after the attacks. It contained a cashier's check made out to a flight school in Phoenix; four drawings of the cockpit of a 757 jet; a box-cutter-type knife; and maps of Washington and New York. One map had a telephone number that led police to Mohamed Abdi, who is being held without bond in Alexandria, Virginia, as a material witness.

Salem Alhazmi, 20, is believed to have been from Saudi Arabia. He was among the five hijackers who went to the Arlington Department of Motor Vehicles on 2 August seeking identity cards.

UNITED AIRLINES FLIGHT 93, crashed into rural Pennsylvania

Jarrah: Part of Hamburg cell

Ziad Samir Jarrah, believed to be the pilot aboard Flight 93, was part of the terrorist cell in Hamburg, Germany, that also included Atta and Al-Shehhi. Two other members of that cell, Said Bahaji and Ramzi Binalshibh, are being sought by German authorities on warrants charging them with more than 5,000 counts of murder. Jarrah is listed as a pilot in Hamburg in FAA records.

Saeed Alghamdi is one of three hijackers that US officials have said are linked to Osama bin Laden's al-Qaida network.

Ahmed Ibrahim A. Al Haznawi, 20, may have been from Saudi Arabia and may have lived in Delray Beach, Florida.

Ahmed Alnami used several aliases and may have lived in Delray Beach, Florida.