Mangaluru:  Mangaluru Police, on Friday night, have arrested eight persons who were allegedly posing as National Crime Investigation Bureau (NCIB) personnel and extorting money from people.  The accused have been identified as T. Sam Peter (53), a native of Kerala, T.K. Bopanna (33) of Siddapur in Madikeri, Madan (41) of Bengaluru South, Chinnappa (38) of…