In this task, you're given the title of a five-sentence story and the first four sentences. Your job is to write the last sentence of the story such that it seamlessly connects with the rest of the story.

Title: Terrorist Threats. Sentence 1: Officer Lang answered the call when it came to the station. Sentence 2: The caller said a bomb was planted in the police station. Sentence 3: An FBI agent told Lang to keep the caller on the phone. Sentence 4: The FBI agent traced the call to a cell phone 3 miles away.
But the phone was a prepay, they couldn't identify the caller.