SMA PLT IS INTERCEPTED BY A NYC POLICE HELI WHILE FLYING IN THE VFR HUDSON RIVER CORRIDOR.

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TODAY; I HAD A CUSTOMER WITH A PVT PLT CERTIFICATE WHO CALLED UPON MY SVCS AND EXPERIENCE; TO ASSIST HIM WITH A FLT THROUGH THE HUDSON RIVER CORRIDOR. THE FLT WENT SMOOTHLY AND MUCH LIKE ALL THE OTHER FLTS I HAD FLOWN ALONG THIS CORRIDOR; UNTIL WE PASSED OVER THE GEORGE WASHINGTON BRIDGE. AS WE WERE APCHING THE BRIDGE NBOUND; WE NOTICED A FORMATION OF 2 PIPER SUPERCUBS APCHING IN THE OPPOSITE DIRECTION; SBOUND. THEY ANNOUNCED THEIR POS AND STATED THAT THEY WERE AT 1000 FT. HOWEVER; IT SEEMED AS IF THEY WERE LOWER THAN WHAT THEY HAD STATED. IN ORDER TO ENSURE THE SAFETY OF ALL PARTIES INVOLVED; I FELT THAT AS PIC OF MY ACFT IT WAS NECESSARY TO REMAIN AT A LOWER ALT THAN I WOULD HAVE NORMALLY FLOWN. HOWEVER; NOT BEING CERTAIN THAT THE OTHER ACFT HAD ME IN SIGHT; I FELT THAT IT WAS NECESSARY TO MAINTAIN AS MUCH VISUAL SEPARATION AS SAFELY POSSIBLE. WHILE THIS COMPLICATION FORCED ME TO REMAIN AT A LOWER ALT THAN I WOULD HAVE LIKED; I STILL FELT THAT THE ALT I CHOSE ENSURED THE SAFETY OF ALL PERSONS INVOLVED. AS SOON AS I VERIFIED THAT THE TFC WAS SAFELY BEHIND ME; I IMMEDIATELY CLBED TO A HIGHER; MORE COMFORTABLE ALT. IT WAS AT THIS TIME THAT A PORT AUTH POLICE DEPT HELI ANNOUNCED THAT HE WAS JUST OFF MY L WING AND PROCEEDED TO ASK ME FOR MY TAIL NUMBER. IN COMPLIANCE WITH HIS REQUEST I IMMEDIATELY STATED MY TAIL NUMBER BACK TO HIM. I THEN ASKED HIM IF I HAD DONE SOMETHING WRONG; AND RECEIVED NO RESPONSE FROM THE POLICE HELI. SECONDS LATER THE HELI BROKE TO THE L AND FLEW OUT OF SIGHT.