On 11 September 2001, international Islamist group Al-Qaeda hijacked four passenger planes, and deliberately flew two of them into the World Trade Center, one into The Pentagon, and crashed the other in a field in Pennsylvania, killing 2,998 people.
A brief history of Irish Republican terrorism.
Palestinian terrorism, including events in Munich, in September 1972, when militant group Black September kidnapped and murdered 11 Israeli sportspeople.
The murder of Luis Carrero Blanco. On 20 December 1973, the Prime Minister of Spain was assassinated with a car bomb, by communist group ETA.
Formed in 1970, the Brigate Rosse (Red Brigades) sought to create a revolutionary state through armed struggle and to separate Italy from the Western Alliance (NATO). The Red Brigades’ main aim was the overthrow of the Italian government, the weakening of NATO and the creation of a Marxist state.
Terrorist acts committed by far-left group Baader Meinhof Gang / Red Army Faction in Germany in the 1970s and 1980s.
EOKA's attacks on police stations, government offices and military installations on Cyprus in the 1950s.
The history of Egyptian terrorism, including the 17 November 1997, murder of 59 foreign tourists, three police officers and a tour guide by Egyptian group al-Gama'a al-Islamiyya.
On 21 December 1988, Libya bombed transatlantic Pan Am flight 103 over the small Scottish town of Lockerbie.
The group OAS committed a series of attacks, killing hundreds, in an attempt to keep Algeria governed by France.
In 1974, left-wing group the Symbionese Liberation Army kidnapped heiress Patty Hearst, exerting pressure on her to make them join in their violent activities.
Communist group The Weathermen carried out a series of bombings in the United States from 1969 - 1977.
A history of attacks carried out by white, right-wing Christian group KKK.
The Chechen rebel's who seized a theatre in Moscow and took 800 people hostage in 2002.
The Mau Mau's fight for Kenya's independence from Britain, who are a violent terrorist group founded in the 1950s.
South Moluccans hijacked a train in the Netherlands on 23 May 1977, demanding independence for their homeland.