From Ammoland:

In Pittsburgh, police staffing shortages are currently so critical that the Department has just announced its officers will no longer respond to calls involving theft, harassment, criminal mischief, burglary, etc, during the hours of three to seven am. That time gap is, of course, already expanding as staffing continues to decline and will soon embrace the entire day.

In plain English, police officers will not be arriving as a result of any call from a City resident unless shots are being fired and there are dead bodies lying around!