To recall, Singh had led the NIA team that had arrested two Trinamool leaders last month in connection with the December 2022 blast in Bhupatinagar in East Midnapore district, in which three people died.

After the incident, Trinamool accused Singh of holding a closed-door meeting with BJP leader Jitendra Tiwari just a day before his arrest.

The ruling party first approached the Election Commission of India (ECI) seeking replacement of Singh as superintendent of NIA in West Bengal.

After the poll panel refused to consider the petition, Trinamool approached the Calcutta High Court.

However, the court on Thursday said that since the transfer of an officer of the central agency is an internal matter of the agency, the high court cannot interfere in the matter.

Trinamool had also alleged that apart from meeting Tiwari, Singh had also received an 'envelope' from the BJP leader, an allegation that Tiwari immediately denied and openly challenged Trinamool leaders to prove their allegations. .