Why have so many Kansas City Police helicopters been flying over Johnson County?

Johnson County residents have been reporting numerous Kansas City Police helicopters in the area recently, but the department won't disclose what investigation are involved in the flights.
Since last Friday, social media and local neighborhood apps have been abuzz with talk of police helicopters circling over Johnson County.

Reports of the helicopter activity began Friday evening, Feb. 4, over Roeland Park, near 50th Terrace and Roe Avenue, before moving further south into Merriam, Overland Park and Shawnee.

Here is what we know: