The bombing was planned by the same conspirators who brought down Air India Flight 182 by a bomb that went off nearly an hour later , when the plane was off the west coast of Ireland . Sikh extremists living in Canada are believed to be responsible for both bombings , but only Inderjit Singh Reyat , who lived in Duncan , British Columbia , was convicted in Canadian court . He was found guilty in 1991 in the Narita bombing . In 2003 , shortly before the start of the Air India trial , he made a plea bargain on reduced charges and a promise of testimony against other suspects . He made the bombs used in both attacks
Air India Flight 182
Air India Flight 182
1985 Narita International Airport bombing