In Uttar Pradesh, police has detained four persons in connection with the high profile murder of the then Chief Medical Officer of family welfare department at Lucknow, Dr. B P Singh. He was brutally murdered last month during morning walk under Gomti Nagar area. The Director General of state police Karamveer Singh told media persons at Lucknow that police have seized weapons from them suspected to have been used in the killing of Dr. Singh.