Some people reported that the Mafia is back and is up to their old scheme. They are harassing some hones businessman. They are collecting some protection money from the poor small business. The local police can't take it anymore so they decided to take matters into their own hands.
The idea here is to destroy your target. Just keep on driving until you reach one of the targets. Once, you see it, then you can engage it and bump it till it is destroyed. If you don't want to take matters into your own hands then just follow it and you will see it crash on its own because of the other vehicles nearby.