Any way to find out about a crime?

I was on the number 7 train headed to Manhattan from Queens. An incident in the train car happened in which a man and a woman started  assaulting some passengers. When the train stopped at Queensborough Plaza the man and woman fled out of the train station. . One woman who was struck in the face called police on her cell phone. I  told some MTA workers at the station about what happened  but could do nothing else and left. 

Is  there some kind of online "Police blotter" or crime report page in which you may find news of such a witnessed incident?