The FAA puts up TFRs (temporary flight restrictions) all the time. Reasons can range from sports events, presidential visits, military exercises, etc. In this case, it could be that there were just too many news helicopters persisting in the area, creating an unsafe environment for each other or for law enforcement aircraft.

What's unusual about this one is that it's right off the runway for a Bravo class airport, and the language of the NOTAM does not provide a clause for regularly scheduled passenger aircraft or other aircraft with pre-filed flight plans under active ATC.