Terrorism has affected politics India since its conception, be it the terrorism supported from Pakistan or the internal guerrilla groups such as Naxalites. In 1991 the former prime minister Rajiv Gandhi was assassinated during an election campaign. The suicide bomber was later linked to the Sri Lankan terrorist group Liberation Tigers of Tamil Eelam, as it was later revealed the killing was an act of vengeance for Rajiv Gandhi sending troops in Sri Lanka against them in 1987.