The sister-in-law of Trinamool Congress parliamentarian Abhishek Banerjee, Menaka Gambhir, has been asked by the Central Bureau of Investigation (CBI) to join its probe in the coal smuggling case on Monday.

A CBI team visited her residence at 11 am and questioning is underway.

This comes hours after Abhishek's wife Rujira Narula was also summoned by the agency in relation to the same case.

Rujira Banerjee, the wife of Trinamool Congress (TMC) MP Abhishek Banerjee, responded to the Central Bureau of Investigation (CBI), saying the sleuths may visit her residence between 11am and 3pm on Tuesday.

CBI carried out searches on Friday at 13 locations in four districts of poll-bound West Bengal in connection with the coal smuggling case. CBI raids were carried out in Purulia, Bankura, Pashchim Bardhaman and Kolkata.

Hours after the notice was served in connection with a case registered on November 27, 2020, Banerjee described the developments as “predictable” and “desperate”.

Chief Minister Mamata Banerjee also expressed her outrage over the CBI’s notices, alleging that the agency is working at the behest of the ruling party. Addressing an event hours after the serving of notices, she said, “Don't try to intimidate us with jail. We have fought against guns and are not afraid of fighting against rats.”

The central agency is investigating the theft of coal from the mines of Eastern Coalfields Ltd. The agency had filed a case last year against Anup Manjhi alias Lala, Eastern Coalfield Ltd (ECL) general managers Amit Kumar Dhar and Jayesh Chandra Rai along with ECL chief of security Tanmay Das, area security inspector, Kunustoria Dhananjay Rai and SSI and security in-charge Debashish Mukherjee, according to a report by PTI.