Emergence of right-wing terror elements in the country is a "cause of worry" for the government which, however, says it is not a "big threat" now.
In an interaction with PTI, Union home secretary G.K. Pillai also made clear that action would be taken against any police official who was found implicating innocent youths on serious charges of blasts in the past.
"Right now, they (right-wing elements) are not that big a threat. Whatever intelligence we are getting. But it is a cause of worry. The more radical and fundamental groups you have in the country, it is a cause of worry. That is something we have to tackle," he said.
India cannot afford to have mushrooming growth of radical groups of whatever hue as it was bad for the country, Mr Pillai said, adding the extent of radical right-wing extremist groups was extremely limited as of now.
"What we understand, it is extremely limited. But even 50 or 100 people who are conspiring in one group or different groups to do this or that. It is itself a cause of concern," he said.
Mr Pillai said there are some people who are still at large and the "NIA and CBI are looking for atleast about 20 plus people" in various cases of blasts including the Samjhauta train explosion.
Mr Pillai said the government would firmly deal with these elements as well. "In our point of view all people who indulge in terrorism act are enemies of the state. We treat them all equally."
The Police in Maharashtra and Rajasthan have been probing alleged involvement of right-wing activists in connection with blast cases in Malegaon and Ajmer.
In the wake of Swami Aseemanand's confession that Malegaon The home secretary brushed aside the perception thatthe role of Hindu groups in Samjhauta train blast had put New Delhi on the backfoot and said, "There would not be pressure on us because we are open about it. The investigation are open, courts are free.
"In June, we told (Pakistan) that investigations are on. When something crystallises, we will share it with them. Now we have said as soon as the charge sheet is filed we will share the full details with them because a very large number of Pakistani citizens were killed."
Asked whether Muslim youths arrested in previous cases of blasts, which have been now found to be handiwork of right wing group, would be released, he said, "I think that process is on. As CBI moves for that process of review and release of those detained. That process has already been initiated."
To a question whether right wing groups were finding sympathy within the armed forces and police, the home secretary said, "Nothing has come.. There have been some sympathisers but nothing much" other than Shrikant Purohit, who was a Lieutenant Colonel, and another person.