CBI sleuths conducted raids at three houses of Ghatak in Asansol in Paschim Bardhaman district and one in Lake Gardens area of Kolkata.
The Central Bureau has summoned Trinamool Congress's member of Parliament Abhishek Banerjee's brother-in-law in connection with a case of alleged illegal coalmining from the mines of the Eastern Coalfields Limited (ECL) in West Bengal's Asansol, involving the "kingpin" of the racket, Anup Manjhi, officials said on Friday.
The central probe agency had on Friday carried out a fresh round of searches in connection with the case, they said.
India's retail sector has benefited from the rapid growth in e-commerce
Mumbai, Bangalore, Kolkata are cities of global repute.
India's rank was further amplified by the collapse of the South American and Russian economies.
Experts said many firms had unbilled assets on their books.