JERSEY CITY, N.J. -- Jersey City Police are looking for the person who dropped off about half a dozen rambling letters at locations across the city Wednesday.The incidents set off a bit of a panic Wednesday morning as officers responded to the locations, including City Hall, municipal court, schools, business and residences.Police say there were not threats to any of the locations or individuals.Kelly Robertson received one of the letters."It's a little freaky, especially because I found it inside my apartment, which means that somehow he got in and was able to leave it at the bottom of my steps," she said. "The two doors are actually locked. UPS usually can't even get in, so they leave our packages downstairs. So I'm surprised that he was able to do that."Police believe only one individual was involved, but so far, no arrest has been made.