India Golden Temple: UK investigates 'SAS link' to attack
14 January 2014 Last updated at 22:05 GMT
The violent storming of the Golden Temple in Amritsar - a sacred shrine for Sikhs - was an event that shook India in 1984.
Hundreds of people were killed as Indian troops tried to put down a rebellion.
David Cameron has ordered an investigation into whether there was a British connection.
Recently unclassified documents suggest an SAS officer advised Indian authorities.
Carole Walker reports.