Friday 5-8 pm and Crazy Amount of Police Helicopter Activity...why?

A quiet Friday happy hour in old pasadena other than the constant police helicopters circling around.  What could possibly be going on that necessitates that kind of police presence?  The disconnect is astonishing.  Walking around and it was people shopping, drinking, and otherwise enjoying a beautiful Friday evening.  No signs of violence, anarchy, theft, jaywalking, and no cats in trees as far as I could tell.  Keep up the good work Pasadena PD!  Making the streets noisy for residents and tourists alike!!!