Asking the security forces to deal with the right wing terror groups "sternly and fearlessly", he said that these groups were also radicalising the youth in the same manner as was done by banned SIMI or Indian Mujahideen.
Chidambaram was releasing a book "Indian Mujahideen: The Enemy Within" written by journalist Shishir Gupta at a function yesterday attended by Leader of Opposition in the Rajya Sabha Arun Jaitley among others.
He said that there was no difference between Indian Mujahideen and Hindu terror groups and both were enemies of the country.
"..so actually, we do not have one enemy within today, we have two enemies within and hope there will not be a third or a fourth or fifth," Chidambaram said.
He said while the security establishment must treat it as security issue, build capacity and improve intelligence gathering capacity, the people must deal with the causes of provocation which gives rise to enemies within.
Chidambaram said this cannot be ignored "because if these causes, if these provocations or if these reasons remain and if they continue to motivate and inspire one enemy within or the other enemy within.
"Every year, younger men join the ranks of these enemies, whatever capacity we build in the security establishments would be inadequate to deal with the rising ranks of enemies," the Home Minister said.