The Anti-Corruption Bureau (ACB) on Friday evening arrested senior police inspector Arun Khanvilkar of the Anti Terrorism Squad (ATS) and two othersChetan Desai and Pintu in a graft case. They were produced in a court on Saturday. According to ACB,Khanvilkar had raided a gambling den in Mulund last month and detained a few gamblers. The complainant,who approached the ACB,was one among them. He alleged Khanvilkar along with Desai and Pintu had demanded a sum of Rs 2.6 lakh from him to settle the matter.