REWARDS - Nothing
Officers Tenpenny and Pulaski want you to kill a reporter and his contact. First thing to do is grab a decent car with some speed, then head north to the construction site to grab the sniper rifle that Tenpenny left you (it's in one of the large pipes).
After that, you get a message saying the reporter is at Cranberry Station, so head there before the train leaves (don't worry, the train will leave before you get there, so don't get upset if you think you failed the mission). As you get to the station, you'll see that the train has already left, so get on the tracks and follow its LONG trip.
Once the train arrives at Market Station, get out of your vehicle and quickly head to the street to find any car. The reporter will exit the train and head to the streets to find a cab to the meeting place. The Spook-O-Meter now appears on your screen. Simply make sure that you don't get too close to the reporter, or else you'll fail the mission.
Once he gets a cab, follow it with a bit of distance between you and him to keep the meter empty. Once he arrives at the docks, keep your distance until he meets up with his informant. Once they meet, take out your sniper rifle and shoot one of the two people. This sends the other person running, so just run him down with another weapon to kill him.