PENTTBOM

{{Use American English|date=March 2019}}

{{Use American English|date=March 2019}}

{{Use mdy dates|date=March 2019}}

{{Use mdy dates|date=March 2019}}

[[File:FBI Headquarters - J. Edgar Hoover Building (53840035941) b.jpg|thumb|300x300px|The basement of the [[J. Edgar Hoover Building]], the [[Federal Bureau of Investigation|FBI]]'s headquarters, was used as the base of operations for PENTTBOM]]

[[File:FBI Headquarters - J. Edgar Hoover Building (53840035941).jpg|thumb|300x300px|The basement of the [[J. Edgar Hoover Building]], the [[Federal Bureau of Investigation|FBI]]'s headquarters, was used as the base of operations for PENTTBOM]]

'''PENTTBOM''' (sometimes spelled as '''PENTTBOMB'''{{cite web |title=Federal Bureau of Investigation Casework and Human Resource Allocation |url=https://oig.justice.gov/reports/FBI/a0337/app2.htm |access-date=21 November 2023}}) was the [[Federal Bureau of Investigation|FBI]]'s investigation into the terrorist attacks against the United States on [[September 11 attacks|September 11, 2001]] (9/11), in which [[Hijackers in the September 11 attacks|19 members]] of [[al-Qaeda]] hijacked four U.S. [[Commercial aviation|commercial airliners]] in an attempt to crash them into national landmarks. The name is short for "[[The Pentagon|'''Pen'''tagon]]/[[World Trade Center (1973–2001)|'''T'''win '''T'''owers]] '''Bom'''bs", the "bombs" being three planes that had hit the Pentagon in Virginia, and the [[World Trade Center (1973–2001)|Twin Towers]] ([[1 World Trade Center (1970–2001)|1]] and [[2 World Trade Center (1971–2001)|2]] World Trade Center) in New York City. The [[United Airlines Flight 93|fourth plane]] crashed [[Stonycreek Township, Somerset County, Pennsylvania|in Pennsylvania]] following passenger intervention.

'''PENTTBOM''' (sometimes spelled as '''PENTTBOMB'''{{cite web |title=Federal Bureau of Investigation Casework and Human Resource Allocation |url=https://oig.justice.gov/reports/FBI/a0337/app2.htm |access-date=21 November 2023}}) was the [[Federal Bureau of Investigation|FBI]]'s investigation into the terrorist attacks against the United States on [[September 11 attacks|September 11, 2001]] (9/11), in which [[Hijackers in the September 11 attacks|19 members]] of [[al-Qaeda]] hijacked four U.S. [[Commercial aviation|commercial airliners]] in an attempt to crash them into national landmarks. The name is short for "[[The Pentagon|'''Pen'''tagon]]/[[World Trade Center (1973–2001)|'''T'''win '''T'''owers]] '''Bom'''bs", the "bombs" being three planes that had hit the Pentagon in Virginia, and the [[World Trade Center (1973–2001)|Twin Towers]] ([[1 World Trade Center (1970–2001)|1]] and [[2 World Trade Center (1971–2001)|2]] World Trade Center) in New York City. The [[United Airlines Flight 93|fourth plane]] crashed [[Stonycreek Township, Somerset County, Pennsylvania|in Pennsylvania]] following passenger intervention.