A Labour government would launch an independent inquiry into Britain's military role in the Indian army's 1984 raid on the Golden Temple in Amritsar, a media report quoted Labour leader Jeremy Corbyn as saying.
Corbyn promised that an investigation into Operation Blue Star would be in the party's next manifesto, The Guardian reported.
Sikh groups have repeatedly called for a fresh inquiry into an apparent decision by former prime minister Margaret Thatcher's government to send an Special Air Service officer to New Delhi to advise the Indian government on the operation, it said.
In 2014, UK government documents declassified under the 30-year rule to make such material public had revealed that British military advice was given to Indian forces prior to Operation Blue Star.
The then British Prime Minister David Cameron had ordered a review into this discovery, which led to a statement in Parliament declaring that Britain's role had been purely "advisory" and the Special Air Service (SAS) advice had "limited impact".
Corbyn, speaking at a Sikh Federation event in Watford, said: "You can be very sure that, whenever the election comes, it will be in the next manifesto ... it's a commitment that's going to be there and we will honour that commitment".
Last year, Corbyn also wrote to Prime Minister Theresa May, calling for an independent inquiry and his party has since included the issue as an election pledge in its manifesto for the June 2017 General Election.
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