The RSS and the BJP reacted with outrage after a senior RSS leader was named as a suspect in the 2007 Ajmer blasts, but the Congress claimed the charge-sheet against Indresh Kumar exposed the true nature of the Hindu organisation.
A charge-sheet filed by the Rajasthan police alleges Kumar met conspirators in the blast, which killed three persons and injured 15 on October 11, 2007 at the dargah of Khawaja Moinuddin Chishti.
It says Kumar attended a secret meeting of blast conspirators in a Gujarati guest house in Jaipur on October 31, 2005.
However, the RSS rejected the charges against Kumar.
"We reject the media reports that claim that the name of Indresh Kumar, a senior functionary from New Delhi, features in the Ajmer dargah blast charge-sheet," RSS spokesperson Ram Madhav told PTI.
"It is far from the truth. It will be challenged in the court," he said.
Madhav said the RSS had "extended cooperation to the investigating agencies and that if any individual was found to be involved then due legal recourse may be taken too".
The RSS wanted an impartial probe into the blast and to accuse its senior functionaries without verifying facts is unfair, he said.
Madhav refused to comment on Rajasthan chief minister Ashok Gehlot's statement that the "RSS should accept the truth which has come out".
The BJP said the allegations against Kumar were baseless.
"According to our information Indresh Kumar has not been named as an accused in the charge-sheet. There is nothing substantial or credible against him -- no organisation has been named. How can anyone say that BJP or RSS is involved or that this is saffron terror?" said BJP spokesperson Nirmala Sitharaman.
The Congress accused the RSS of "disturbing communal amity" in the country.
"The RSS has been consistently working to undermine and upset the pluralistic ethos of India and disturb communal amity, which is very essential for progress of any nation. The latest charge-sheet is just a manifestation of its direction right from the beginning," said party spokesperson Manish Tewari.
But the BJP rejected the Congress spokesperson's allegations.
"The Congress says such things for political mileage. This is a political conspiracy against nationalist organisations working for the nation. This shows their political frustration," said Sitharaman.
The Rajasthan police filed a charge-sheet on Friday, alleging that members of a radical Hindu group called Abhinav Bharat carried out the blast.