you play as a police officer trying to stop a gang of attackers around the area near Mt Chilliad. When he did so well when he takes a car to Mt Chilliad he doesnt seem to beat the gang of attackers with AK-47's and cars what seem to not be destroyed (Everything Proof). So he jumps the mountian and it comes up with a Cutscene saying "To Be Continued...."

PS: When you go for the car what is in the garage (which you take to Mt Chilliad) it needs to be pushed out becouse you cant get in it. To get the car out just use sprint and it will come out (you need NOTHING in your hands to do this)