This is a timeline of incidents in 1991 that have been labelled as "terrorism

Terrorism

Terrorism is the systematic use of terror, especially as a means of coercion. In the international community, however, terrorism has no universally agreed, legally binding, criminal law definition...

" and are not believed to have been carried out by a government

Government

Government refers to the legislators, administrators, and arbitrators in the administrative bureaucracy who control a state at a given time, and to the system of government by which they are organized...

 or its forces (see state terrorism

State terrorism

State terrorism may refer to acts of terrorism conducted by a state against a foreign state or people. It can also refer to acts of violence by a state against its own people.-Definition:...

 and state-sponsored terrorism

State-sponsored terrorism

State-sponsored terrorism is a term used to describe terrorism sponsored by nation-states. As with terrorism, the precise definition, and the identification of particular examples, are subjects of heated political dispute...

).
January 4: A criminal group attacks a Carabinieri patrol near San Lazzaro di Savena

San Lazzaro di Savena

San Lazzaro di Savena is an Italian comune of some 30,000 inhabitants in the province of Bologna, Emilia-Romagna.- Geography :...

, Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

, killing 3 officers. January 6: A bomb kills three and wounds seven in La Dorada, Caldas

Caldas

Caldas may refer to:*Çaldaş, Azerbaijan* Caldas Department, in Colombia.* Caldas, Antioquia, a town in Antioquia, Colombia.* Caldas, Minas Gerais, a town in the state of Minas Gerais in Brazil...

. No group claims responsibility. February 7: The Provisional IRA

Provisional Irish Republican Army

The Provisional Irish Republican Army is an Irish republican paramilitary organisation whose aim was to remove Northern Ireland from the United Kingdom and bring about a socialist republic within a united Ireland by force of arms and political persuasion...

 launched a mortar shell into the back garden of 10 Downing Street

10 Downing Street

10 Downing Street, colloquially known in the United Kingdom as "Number 10", is the headquarters of Her Majesty's Government and the official residence and office of the First Lord of the Treasury, who is now always the Prime Minister....

, London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

. (See 10 Downing Street#Security) February 16: The Medellín Cartel

Medellín Cartel

The Medellín Cartel was an organized network of "drug suppliers and smugglers" originating in the city of Medellín, Colombia. The drug cartel operated in Colombia, Bolivia, Peru, Central America, the United States, as well as Canada and Europe throughout the 1970s and 1980s. It was founded and...

 detonates a 440-pound car bomb near the Medellín

Medellín

Medellín , officially the Municipio de Medellín or Municipality of Medellín, is the second largest city in Colombia. It is in the Aburrá Valley, one of the more northerly of the Andes in South America. It has a population of 2.3 million...

 bullring, killing 22 people, including 9 police officers. March 18: A car bomb blast in Antelias area, Beirut

Beirut

Beirut is the capital and largest city of Lebanon, with a population ranging from 1 million to more than 2 million . Located on a peninsula at the midpoint of Lebanon's Mediterranean coastline, it serves as the country's largest and main seaport, and also forms the Beirut Metropolitan...

, Lebanon

Lebanon

Lebanon , officially the Republic of LebanonRepublic of Lebanon is the most common term used by Lebanese government agencies. The term Lebanese Republic, a literal translation of the official Arabic and French names that is not used in today's world. Arabic is the most common language spoken among...

. No claim for responsibility in this blast, which killed eight people, injured 21 people, including Lebanese

Lebanon

Lebanon , officially the Republic of LebanonRepublic of Lebanon is the most common term used by Lebanese government agencies. The term Lebanese Republic, a literal translation of the official Arabic and French names that is not used in today's world. Arabic is the most common language spoken among...

 Defense Minister Michel Murr

Michel Murr

Michel Murr is a Lebanese politician and businessman. He first occupied the post of Minister of the Interior, as well as being Deputy Prime Minister in Rafik Hariri's first cabinet in 1992 and remained in the post in all subsequent cabinets formed by Hariri, except the last one, in which his son,...

. May 13: Nine police officers die while deactivating a bomb left behind by leftist guerillas. May 21: Former Indian prime minister Rajiv Gandhi

Rajiv Gandhi

Rajiv Ratna Gandhi was the sixth Prime Minister of India . He took office after his mother's assassination on 31 October 1984; he himself was assassinated on 21 May 1991. He became the youngest Prime Minister of India when he took office at the age of 40.Rajiv Gandhi was the elder son of Indira...

 assassinated in a bomb blast believed to be the work of Sri Lankan Tamil terrorists belonging to the LTTE. This is also the first time that the suicide vest is used by any terrorist group. May 29: Basque

Basque nationalism

Basque nationalism is a political movement advocating for either further political autonomy or, chiefly, full independence of the Basque Country in the wider sense...

 ETA

ETA

ETA , an acronym for Euskadi Ta Askatasuna is an armed Basque nationalist and separatist organization. The group was founded in 1959 and has since evolved from a group promoting traditional Basque culture to a paramilitary group with the goal of gaining independence for the Greater Basque Country...

 separatist group bombs the Guardia Civil police barracks in Vic

Vic

Vic is the capital of the comarca of Osona, in the Barcelona Province, Catalonia, Spain. Vic's location, only 69 km far from Barcelona and 60 km from Girona, has made it one of the most important towns in central Catalonia.-History:...

 (Barcelona

Barcelona (province)

Barcelona is a province of eastern Spain, in the center of the autonomous community of Catalonia.-Overview:It is bordered by the provinces of Tarragona, Lleida, and Girona, and by the Mediterranean Sea....

), killing ten people. May 30: A train traveling from Moscow

Moscow

Moscow is the capital, the most populous city, and the most populous federal subject of Russia. The city is a major political, economic, cultural, scientific, religious, financial, educational, and transportation centre of Russia and the continent...

 to Baku

Baku

Baku , sometimes spelled as Baki or Bakou, is the capital and largest city of Azerbaijan, as well as the largest city on the Caspian Sea and of the Caucasus region. It is located on the southern shore of the Absheron Peninsula, which projects into the Caspian Sea. The city consists of two principal...

 explodes near Karvin-Yurt station between Gudermes

Gudermes

Gudermes is a town in the Chechen Republic, Russia, located on the Sunzha River east of Grozny. Population: 32,000 .Gudermes had a rural locality status until 1941. Later, it became a railroad junction between Rostov-on-Don, Baku, Astrakhan, and Mozdok. Gudermes is home for oil extraction...

 and Makhachkala

Makhachkala

-Twin towns/sister cities:Makhachkala is twinned with: Sfax, Tunisia Siping, China Spokane, United States Vladikavkaz, Russia Yalova, Turkey Ndola, Zambia-See also:*...

 in Dagestan

Dagestan

The Republic of Dagestan is a federal subject of Russia, located in the North Caucasus region. Its capital and the largest city is Makhachkala, located at the center of Dagestan on the Caspian Sea...

, Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

. Eleven people die and eight are injured. July 12: Leftist groups bomb the runway at the Rafael Núñez International Airport

Rafael Núñez International Airport

Rafael Núñez International Airport is an airport located in the city of Cartagena, Colombia. It is the second largest airport on the Caribbean coast of Colombia, and the largest in the region in terms of passenger movement....

 in Cartagena

Cartagena, Colombia

Cartagena de Indias , is a large Caribbean beach resort city on the northern coast of Colombia in the Caribbean Coast Region and capital of Bolívar Department...

. October 18: Two time bomb blast, when people watching a Hindu pageant of Ramila, Rudrapur, Uttar Pradesh

Rudrapur, Uttar Pradesh

Rudrapur is a town and a nagar panchayat in Deoria district in the Indian state of Uttar Pradesh.-Demographics: India census, Rudrapur had a population of 28,324. Males constitute 51% of the population and females 49%. Rudrapur has an average literacy rate of 52%, lower than the national average of...

, India, which blame on Sikh

Sikh

A Sikh is a follower of Sikhism. It primarily originated in the 15th century in the Punjab region of South Asia. The term "Sikh" has its origin in Sanskrit term शिष्य , meaning "disciple, student" or शिक्ष , meaning "instruction"...

 separatist militant. Killing at least 41 and injuring 140 people. November 15: Two Provisional IRA members were killed in St Albans

St Albans

St Albans is a city in southern Hertfordshire, England, around north of central London, which forms the main urban area of the City and District of St Albans. It is a historic market town, and is now a sought-after dormitory town within the London commuter belt...

when their bomb detonated prematurely. A civilian was also injured.