At a press conference when asked to comment on the court order in the case, party leader Kapil Sibal said that Congress "knows" that Prime Minister Narendra Modi has met his Italian counterpart though the government has denied any such meeting.
Party's chief spokesman Randeep Surjewala said the stand taken by the Modi government today is a great injustice to the family of deceased fishermen of Kerala.
He said it reaffirmed and established prima facie the allegations that Prime Minister was "cutting an underhand deal to malign the Congress leadership and party" in the AgustaWestland issue.
Earlier this month, AICC had alleged that Modi government "entered into a conspiracy" to "falsely accuse" the party leadership in the AgustaWestland chopper case and made a "weak defence" in the Italian marines case as "quid pro quo".
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"Recent order of the Permanent Court of Arbitration in The Hague confirms the claim that Modi government has entered into a conspiracy to falsely accuse Congress leadership in AgustaWestland case in return for a weak defence in Italian marines case," party spokesman Jyotiraditya Scindia had said about three weeks ago.
The other marine Massimiliano Latorre is already in Italy on health grounds and his stay there was recently extended by the apex court till September 30.