Civil Aviation Minister K Rammohan Naidu said on Tuesday that there is "no manipulation or dirty business" happening in the investigation into the Air India plane crash that killed 260 people on June 12.

Naidu's statement came against the backdrop of concerns expressed in certain quarters about the Aircraft Accident Investigation Bureau (AAIB) probe into the fatal crash. Also Read | SC slams Air India crash report as ‘irresponsible’; seeks response of Centre

"There is no manipulation, or there is no dirty business, happening in the investigation. It is a very clean and very thorough process that we are doing according to the rules...," Rammohan Naidu was quoted by news agency PTI as saying.

The minister also said it will take some time for the final AAIB report into the crash

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