Two pistols used in killing Chief Medical Officer B P Singh have been recovered and the links of arrested shooters with Deputy CMO Y S Sachan have been established digitally through their call records a senior official on Sunday July 3 said The pistols were recovered from three persons - R K Verma Vinod Sharma and Anand Tiwari - arrested by the STF on June 17 Cabinet Secretary Sahashank Shekhar Singh told reporters in Lucknow