National Investigation Agency (NIA) has registered a case against some "Khalistani elements" and member of Sikhs For Justice (SFJ) Jaswinder Singh Multani, sources said on Friday.
The anti-terror agency registered the case late on Thursday following orders received from the Ministry of Home Affairs (MHA).
The move comes following a series of reports that allegedly exposes the Khalistani terrorists plans to cause large-scale disturbance in poll-bound Punjab in cahoots with Pakistan's intelligence agency ISI.
Multani, a prominent member of the designated terror group Sikhs For Justice (SFJ), has allegedly been linked to the Ludhiana court blast case.
A bomb blast had occurred at the Ludhiana court complex on December 23 that killed one and injured two others.
Multani was held by police in Germany on December 22. He has been residing in Erfurt, Germany.
A police officer said that during the investigation names of two suspects residing in Pakistan and Germany, both from banned Sikh organizations, have emerged. Sikhs For Justice is a designated terror group in India.
Intelligence agencies had earlier raised an alert about Harvinder Singh Sandhu, a Babbar Khalsa terrorist who is currently in Pakistan, and Multani, a close associate of SFJ's Gurpatwant Singh Pannu, residing in Germany, about their involvement in the Ludhiana blast.
Multani recently came to notice for allegedly arranging and sending weapons consignments comprising explosives, hand grenades from across the border to Punjab. These weapons were sent with the help of his Pakistan-based operatives and arms smugglers.
He has been allegedly planning to carry out terrorist activities in Punjab by using the smuggled consignments through gangsters and extremists in the state.
Multani is also learnt to be closely connected with Khalistani leaders like Hardeep Singh Nijjar, Paramjit Singh Pamma, Sabi Singh, Kulwant Singh Mothada and others.