Claiming that there is more to it than what meets the eye, former prime minister Lal Bahadur Shastri's family is demanding that all documents related to his death should be de-classified.

Shastri's son and Congress leader Anil Shastri said blue marks and white spots were found on his father's body which showed signs of foul play. "I personally feel there could have been foul play. Can't say so conclusively, but the negligence is clear, everyone went scot free, no one was punished," he said.

Recalling the past he said, "there was a butler who was arrested and released. My mother wanted to meet him when she went to Tashkent. But she was told he could not be traced."

He also said that it was "very shocking that both his personal physician RN Chugh and personal assistant met with accidents. Both had to depose before inquiry commissions. Coincidence twice is a little improbable."

He added that his personal diary was never found. "His personal diary never came back. He jotted down notes daily in it. It could have mentioned Tashkent agreement. Even the thermos next to him was never brought back. His death could have been from something in the thermos flask," he added.