A B06 PLT AND A B407 PLT VIOLATED A TFR INVOLVING A PWR PLANT.

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ON 11/MON/01 APPROX XA30 LCL; I WAS FLYING A NEWS HELI AND WAS DISPATCHED TO A POLICE CHASE THAT WAS TRAVELING SBOUND HEADING TOWARDS ZZZ ARPT. I CAUGHT UP WITH THE CHASE NINE MI N OF ZZZ ARPT AT 700 FT AGL. AT THAT TIME I CONTACTED ZZZ TWR AND REQUESTED A TRANSITION SBOUND ON THE TURNPIKE. THE TWR APPROVED THE SBOUND TRANSITION AND GAVE ME A TRANSPONDER CODE. I WAS ALSO TOLD TO STAY W OF THE ARPT AT ALL TIMES DURING THE TRANSITION. BECAUSE THE HWY IS AROUND THREE MI W OF THE ARPT I CONTINUED FOLLOWING THE POLICE CHASE SBOUND. THE CHASE ENDED 50 MI S OF ZZZ ARPT. ON THAT DAY THERE WAS A TFR SET UP AROUND THE PWR PLANT WHICH EXTENDED OUT TO TEN MILES. THIS PWR PLANT IS 4 TO 5 MI SE OF ZZZ ARPT. DURING THE CHASE AND WHILE IN ZZZ AIRSPACE I LATER REALIZED I FLEW WITHIN 7 MILES OF THE PWR PLANT. IT WAS NOT INTENTIONAL AND AT NO TIME DID I FLY DIRECTLY TOWARDS THE PWR PLANT. I WAS TOLD THE NEXT DAY THAT ZZZ TWR IS NOT THE CONTROLLING AGENCY. BECAUSE I WAS IN CONTACT WITH THE TWR AND WAS GIVEN A TRANSPONDER CODE MY UNDERSTANDING WAS THAT I COULD CONTINUE THE TRANSITION S ON THE TURNPIKE. IT WAS ALSO VERY DIFFICULT TO DETERMINE THE TEN MILE RING BECAUSE NO COORDINATES WERE GIVEN TO IDENTIFY THE PWR PLANT. SUPPLEMENTAL INFO FROM ACN 529590: WHILE ON A NEWS FLT IN CLASS D AIRSPACE WE WERE SENT S TO FIND A CAR CHASE IN PROGRESS. WHEN WE FOUND THE CAR IT WAS IN A RESIDENTIAL NEIGHBORHOOD AND DROVE ONTO THE HWY GOING S. NOT KNOWING THE EXACT LOCATION OF PWR PLANT I CALLED ZZZ TWR AND ASKED FOR A S TRANSITION ALONG THE HWY TO FOLLOW THE CAR; ABOUT THE SAME TIME THE POLICE HELI CAME ON SCENE. THE CTLR GAVE POLICE; MYSELF; AND ANOTHER HELI PERMISSION TO PROCEED WITH SQUAWK CODES; ASKING THAT WE STAY W OF THE ARPT. GOING S I REALIZED WE WERE INSIDE 10 MI OF POWER PLANT. I THINK NOTAMS FOR TFRS SHOULD HAVE LATITUDE AND LONGITUDE INCLUDED IN THEM.