More than 400 Gurdwaras and Sikh organisations are calling on Sir Keir Starmer to launch an inquiry he promised into potential British involvement in the Golden Temple Massacre.

The groups have signed a letter that was sent to the prime minister urging him to follow through on a commitment made in 2022.

The calls relate to questions around what part the UK and British special forces played in the 1984 killings, in which hundreds of Sikhs died after the Indian military entered the temple complex where separatists had sought refuge.

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In 2014, the UK government accidentally revealed Margaret Thatcher was aware of the Indian state’s intention to raid the temple and in the months before the raid, a British SAS officer provided advice to the Indian government.

A subsequent investigation commissioned by David Cameron found that a single officer provided advice – and there was “no evidence of UK government involvement in the operation itself”.

However, this investigation was criticised as a cover-up due to its limited scope and quick timeframe.

In 2022, Sir Keir wrote to all Gurdwaras and Sikh organisations, saying: “A future Labour government will open an independent inquiry into Britain’s military role in the Indian army’s 1984 raid on the Golden Temple in Amritsar. It is important that we are open, transparent and above reproach in understanding any role the UK may have played in such events.

“This is something I know is important to our Sikh communities here and throughout the world.”

However, an announcement on the inquiry is yet to materialise.

In the letter sent to the prime minister by the Sikh Federation, seen by Sky News, Sir Keir is told: “If what is eventually proposed by a Labour government fails to deliver the ‘truth’ as promised by you this will have massive political ramifications for the Sikh community’s support for Labour in future elections for many generations.”

The federation says an inquiry “must” be announced by 31 May.

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In a letter to Labour MPs, the Sikh Federation also called on them to put pressure on the government to start an inquiry.

The organisation also said it had heard “extremely worrying rumours” that the Foreign, Commonwealth And Development Office has been under pressure from the Indian government to “avoid or limit” an independent inquiry.

It added: “Civil servants are understood to be advising that a public inquiry is expensive and could damage relations with India.”

The UK is currently trying to negotiate a new trade agreement with India in the wake of Brexit. Attempts by the Conservative government failed due to a difference in position over visas.

There is a campaign among some in the Sikh community for an independent nation to be established – known as Khalistan – out of parts of the Punjab region in northern India.

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These efforts are strongly opposed by Narendra Modhi’s Hindu nationalist BJP movement.

The FCDO and Downing Street have been approached for comment.