This is a timeline of incidents in 1991 that have been labelled as "terrorism" and are not believed to have been carried out by a government or its forces (see state terrorism and state-sponsored terrorism).

Guidelines To be included, entries must be notable (have a stand-alone article) and described by a consensus of reliable sources as "terrorism". List entries must comply with the guidelines outlined in the manual of style under MOS:TERRORIST. Casualty figures in this list are the total casualties of the incident including immediate casualties and later casualties (such as people who succumbed to their wounds long after the attacks occurred). Casualties listed are the victims. Perpetrator casualties are listed separately (e.g. x (+y) indicate that x victims and y perpetrators were killed/injured). Casualty totals may be underestimated or unavailable due to a lack of information. A figure with a plus (+) sign indicates that at least that many people have died (e.g. 10+ indicates that at least 10 people have died) – the actual toll could be considerably higher. A figure with a plus (+) sign may also indicate that over that number of people are victims. If casualty figures are 20 or more, they will be shown in bold. In addition, figures for casualties more than 50 will also be underlined. Incidents are limited to one per location per day. If multiple attacks occur in the same place on the same day, they will be merged into a single incident. In addition to the guidelines above, the table also includes the following categories:

List DateType Dead InjuredLocation ArticleDetails Perpetrator Part ofJanuary 6Bombing37La Dorada, Caldas, Colombia A bomb kills three and wounds seven. No group claims responsibility.The Chicago Sun-Times, January 7, 1991, Page 58 UnknownColombian conflictJanuary 9Shooting2 (+28)8Cerro Girasoles, Meta Department, ColombiaThe Toma del Cerro Girasoles was an attack perpetrated by the guerrilla of the (FARC) against the Girasoles military base, located in the mountainous region of the Serranía de la Macarena. In spite of the number of casualties on the side of the FARC, in the attack they depleted the ammunition of the garrison of the army that was in the base and had to surrender. FARCColombian conflictJanuary 29Ambush9UnknownTibú, Colombia9 soldiers are killed in an ambush by the National Guerrilla Coordinator (CNG) in Norte de Santander. The truck in which it was mobilized with explosive weapons and fire of machine guns.Coordinadora Nacional GuerrilleraColombian conflictFebruary 7Mortar attack04London, United KingdomDowning Street mortar attackThe Provisional IRA launches homemade mortar shells at 10 Downing Street in an attempt to assassinate Prime Minister John Major and his war cabinet.PIRAThe TroublesFebruary 18Bombing138London, United KingdomVictoria station and Paddington station bombings Two bombs at London mainline stations, one at Victoria station and the other at Paddington station killing one person and injuring 38 other people all in the Victoria station bombing.CAIN: Sutton Index of DeathsPIRAThe TroublesFebruary 26Shooting39Amazonas State, BrazilFARC guerrillas assaulted the Solimoes post in the remote region of the Traira river near the border with Colombia. The attack left three Brazilian soldiers dead and nine wounded. In response the Brazilian army launched Operation TrairaFARCColombian conflictMarch 2Bombing1973Colombo, Sri LankaHavelock Road BombingAt least 19 people, including Sri Lanka's Deputy Defence Minister, Ranjan Wijeratne killed in an LTTE car bomb explosion. A further 73 people injured.BBC News: "On This Day" March 2, 1991: Sri Lankan hardliner among 19 killed in blastLTTESri Lankan Civil WarMarch 20Shooting, Kidnapping359 Antioquia Department, ColombiaAt San Jose de Nus, near Cabañas Station, located in Caracolí, a group of ELN guerrillas stops a train and kidnaps 42 recruits from the National Army. On the same day, FARC rebels attack the town of Santa Helena del Opón, in Santander, killing 3 soldiers and kidnapping 17 more.ELN and FARCColombian conflictMarch 26Hijacking0 (+4)2SingaporeSingapore Airlines Flight 117Four members of the Pakistan People's Party hijack Singapore Airlines Flight 117 and demand the release of Asif Ali Zardari. The hijackers were killed after the plane was stormed by police and were the only fatalities.Pakistan People's PartyMarch 28Shooting30Craigavon, United KingdomCraigavon mobile shop killingsThe Ulster Volunteer Force (UVF) carried out a gun attack on a mobile shop in the Drumbeg estate in County Armagh, shooting dead three Catholic civilians. Two of those killed were teenage girls.UVFThe TroublesApril 19Bombing6 (+1)94Patras, GreeceTwo Palestinian terrorists tried to place a bomb to the British Consulate. The bomb exploded prematurely possibly due to an adjusting error, killing one terrorist and six other Greek bystanders. Palestinian Islamic JihadIsraeli–Palestinian conflictMay 6–7Shooting3 (+20)10San Pablo, Bolívar, ColombiaGuerrillas of the Simón Bolívar Coordinator attack the municipality. Three policemen die, but with backing of units of the Marine Corps, the rebels are rejected.CGSBColombian conflictMay 13Bombing9UnknownColombiaNine police officers die while deactivating a bomb left behind by leftist guerrillas.San Jose Mercury News, May 14, 1991, Page 5ACGSBColombian conflictMay 21Suicide bombing, assassination15 (+1)43Sriperumbudur, IndiaAssassination of Rajiv GandhiFormer Indian prime minister Rajiv Gandhi assassinated in a bomb blast believed to be the work of Sri Lankan Tamil terrorists belonging to the LTTE.BBC News: Timeline of the Tamil conflict, September 4, 2000 This is also the first time that the suicide vest is used by any terrorist group.LTTESri Lankan Civil WarMay 23Shooting101Sardinata, ColombiaCGSB guerrillas ambush a police patrol in the village of Las Mercedes, Norte de Santander. 7 uniformed and 3 civilians killed.CGSBColombian conflictMay 29Car bombing1044Vic, SpainVic bombingA car bomb explodes near a Civil Guards barracks. The attack killed 10 people, including five children, and injured 44 people.ETABasque conflictMay 30Bombing118Dagestan, Soviet UnionA train traveling from Moscow to Baku explodes near Karvin-Yurt station between Gudermes and Makhachkala in Russia. 11 people die and eight are injured.Nezavisimiya Gazeta via Russkiy Zhurnal (in Russian), May 29, 2001UnknownMay 31Bombing314Northern Ireland, United KingdomGlenanne barracks bombingThe Provisional IRA launched a large truck bomb attack on a British Army (Ulster Defence Regiment) base in County Armagh. Three soldiers were killed; ten soldiers and four civilians were wounded. The blast left a deep crater and it could be heard over 30 miles away. Most of the UDR base was destroyed by the blast and the fire that followed. PIRAThe TroublesJune 15Massacre80–126UnknownLudhiana district, India1991 Punjab KillingsSikh militants massacre mostly Hindu passengers on two trains.Sikh militants Insurgency in PunjabJune 19Shooting1515Sucre, ColombiaELN guerrillas ambush a police patrol in Corral Viejo, village of San Benito Abad; 7 police die. Meanwhile, in Barranco Colorado, on the banks of the Ariari River, between the towns of Puerto Lleras and San José del Guaviare, guerrillas from front 1 of the FARC ambushed a patrol of the Marine Corps and killed 8 soldiers.ELN and FARCColombian conflictJune 21Suicide car bombing6085Colombo, Sri LankaJOC bombingSuicide car bombing targeting the headquarters of the Joint Operations Command of the Sri Lankan Armed Forces.LTTESri Lankan Civil WarJune 28Bombing4 30Seville, SpainA package bomb, presumably sent by ETA, caused the death in jail of a prison official, two inmates and a relative of an inmate. The explosion, which destroyed several rooms in the center, also injured other 30 people.ETA Basque Conflict August 15Attempted Attack3 (+12)7Santa Rosa de Simití, ColombiaGuerrillas from FARC Front 24 attacked the town. The attack fails and 12 insurgents die.FARCColombian conflictSeptember 16Car bombing330Mutxamel, SpainMutxamel bombingAn ETA car bomb explodes while being towed away from an army barracks. The police were unaware it was a car bomb and had assumed it was an abandoned car.ETABasque conflictOctoberPlot00Toronto, Ontario, Canada1991 Toronto bomb plotFive men of West Indian origin with links to Jamaat ul-Fuqra are arrested near the Canada–US border and later convicted of a plot to bomb a Hindu temple and an Indian theatre.Jamaat ul-FuqraOctober 15Massacre20283Palliyagodella, Sri Lanka Palliyagodella massacreLTTE cadres attacked a Muslim village and shot and hacked to death 182 civilians (171 of them were Muslims), twelve policemen and eight soldiers; 83 others were injured.LTTESri Lankan Civil WarOctober 17Bombings41140Rudrapur, India1991 Rudrapur bombingsRudrapur bombings: Two time bomb blasts, when people watching a Hindu pageant of Ramila, which was blamed on Sikh separatist militant. At least 41 killed and 140 injured.Sikh militantsInsurgency in Punjab2 NovemberBombing211Belfast, United KingdomMusgrave Park Hospital bombingThe Provisional IRA exploded a bomb at the military wing of Musgrave Park Hospital. Two British soldiers were killed and 11 other people were injured, among them a five-year-old girl and a baby of four months.PIRAThe TroublesNovember 18Shooting15 (+12)UnknownPutumayo District, Colombia1 petty officer and 9 agents are killed on the road connecting Villa Garzon and Mocoa. Meanwhile, 12 insurgents, one soldier and three other police officers were killed in other events in several departments of the country.FARC Front 32Colombian conflict20 NovemberAssault transport helicopter220Karakend, near Khojavend District, Azerbaijan1991 Azerbaijani Mil Mi-8 shootdownOccurred when an Azerbaijani MI-8 military helicopter, carrying a peacekeeping mission team consisting of 13 Azerbaijani government officials, 2 Russian and 1 Kazakhstani Ministry of Internal Affairs officials, 3 Azerbaijani journalists and 3 helicopter crew was shot down amidst heavy fighting by Armenian separatists. All 22 people (19 passengers and 3 crew) on board were killed in the crash.Armenian separatistsNagorno-Karabakh conflictDecember 21Bombing06Budapest, HungaryCar bomb of RAF explodes near the bus of Soviet Jewish migrants.Red Army Faction member faces 15 years for bomb attack, The Scotsman (March 7, 2004)Red Army FactionDecember 26Massacre4920+Punjab, IndiaSikh militants massacre 49 mostly Hindu passengers on a train traveling from Ludhiana to Ferozepur.49 Slain by Gunmen on Train in India, The New York Times (December 27, 1991)Sikh militants Insurgency in PunjabDecember 30Car bomb15+120West Beirut, LebanonMainly Shi’a district.Middle East International No 416, 10 January 1992 Publishers Lord Mayhew, Dennis Walters MP; Jim Muir p.12

See also List of terrorist incidents

References