EMB ERJ 170/175 ER/LR
Air Traffic Control Fully Certified
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict NMAC
Flight Crew Took Evasive Action
Procedure; Human Factors
An EMB-175 checked in with me on about a 10 mile final and I cleared him to land XXL. At the time it appeared that there was a VFR near the marker moving north. I then went on to talk to a [another airliner] and a few helicopters. North RADAR (NR) called up and said I did not issue the EMB-175 that traffic. I immediately issued the traffic; still thinking he was northbound. The EMB-175 then started telling me how the aircraft had turned towards him and he had to take actions to miss hitting the aircraft. I called down to the TRACON and was informed that the Piper Aztec had the EMB-175 in sight and was maintaining visual with him. I advised the EMB-175 pilot of this and he said he was going to file a NMAC. I informed the Supervisor of his actions. I then went down to the TRACON and was told we did everything right; no rules broken. Have picture taking aircraft remove themselves from final.
Local Controller described NMAC event when an air carrier on final declared same with a helicopter operating near the final that was maintaining visual separation with the air carrier.