Bengaluru police find evidence of mobile phone exchange at Union Minister Kumaraswamy's residence in sting operation case, intensifying investigation. Bengaluru: In a major twist, Commissioner of Police, Bengaluru City, Seemanth Kumar Singh, said on Sunday that investigators have found evidence suggesting that a mobile phone was exchanged at the residence of Union Minister for Heavy Industries and Steel H.D. Kumaraswamy in connection with the alleged sting operation case.