Police on Tuesday nabbed three persons for trying to circulate counterfeit currency notes of Rs.100 denomination. The arrested have been identified as Pittala Muninder (32), Pittala Anil (22) and B. Srinivasa Rao (29), all natives of Karimnagar district. The trio was caught while waiting for prospective customers at Tarnaka. Counterfeit currency notes worth over Rs. 2 lakh were seized from them.