New Delhi, Jan 14 (ANI): Tarlochan Singh on Tuesday said that a through enquiry against the Indian government needs to be done over the newly released documents revealing that the British elite force, SAS, had advised India on flushing out Sikh militants months before Operation Blue Star in June 1984. Earlier on Monday, British Prime Minister David Cameron directed his Cabinet Secretary to establish the facts behind claims that Margaret Thatcher's government may have helped Indira Gandhi plan Operation Bluestar in 1984.