While exploring the game world, you will be, quite often, receiving information of crimes in progress taking place nearby. You will be guided towards the site of a particular crime by means of prompts displayer in the upper right corner of the screens (the arrow and the current distance from the target). It depends on you only if you take up the mission or not. In the latter case you do not need to take into consideration any negative consequences. What is even more, a similar crime may take place in the very same location, later into the game so, you will not miss anything irreversibly.
The crimes appear in various variants. You can be a witness to a gang war, an attack on the police patrol, or an armless civilian, or simply bump into criminals trying to break into one of the local ATMs. Regardless of the crime type, your task is always the same and it is to eliminate all of the enemies marked in red. I need to warn you here that many of the bandits participating in the crimes pack knives, armors, shields or firearms so, eliminating them may be quite a problem.
For stopping each crime, you are rewarded with 3000 experience points for completing an optional mission, plus for experience points for defeating all of your enemies (the score is kept in the same way as in the case of regular fights).