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At a press conference on Saturday, Civil Aviation Secretary SK Sinha admitted that the last two days had been "very hard", but assured the investigation was proceeding smoothly and in the right direction.

He was most recently interim manager at Lommel SK in the second tier of Belgian football.

It claimed the bomb had been sent under the name "SK Sinha," not Sharma, and cryptically mentioned motives of "betrayal" and money.

The parcel carrying the explosive bore a fake name - SK Sharma from Raipur.

In July, the trading firms settled with the state of California and as part of the settlement, Vitol, SK Energy Americas and South Korea’s SK Trading International have agreed to pay $50 million into two settlement funds.