I just remenber two scenes from the movie. In the first one, a group of about four people is riding a van in a city at night. They are looking for a girl to rape. When they found one, they force her into the van, and when they are about to rape her, an undercover police, I think he is so because he is not wearing a uniform, appears and tries to save the girl. He has a gun and is pointing it towards the criminals. One of the gang members takes the girl as a hostage, grabbing her by the neck and using her as a shield. The undercover police shoots aiming at the gang member but fails and the bullett kills the girl. That is the first scene that I remember.
In the second scene the same undercover police is in an open space, a park or someting like that, with his team trying to capture another gang. He then sees one of the members of the gang and goes after him in a persecution. When he finally captures the criminal, he waits for his teammates to arrive, but the gang member starts to laugh and says that he is only 17 years old and, therefore, there will be no punishment for him as he is underage, they will probably just give him a couple of weeks of community service. The undercover police gets so angry about this that he shoots and kills the gang member. That is everything that I remember from the movie.
I really think that the movie is from the USA and it is probably from the 80’s, the 90’s or the early 2000’s. I would really appreciate your help. Thanks.