Nagpur: Senior IPS officer Vishwas Nangre Patil is set to assume charge as Nagpur city commissioner of police on Monday. Nangre Patil will succeed Ravinder Singal, who replaced the former as additional director general of police in the State Anti-Corruption Bureau. Amid recent attacks on doctors, Nagpur police commissioner Vishwas Nangre Patil, in an exclusive interaction with TOI, said police are focusing on building evidence-backed cases to secure.