meaning of police dreams

 there was a man who shot someone at a train station and then the police were about to take him away but he said it was a fake gun. The police let him go and I was the only witness. So he said he would kill me but unless he wanted my whole family to die i would not tell anyone. So he pretended we were friends and one day at dinner the day before he was going to kill me i thought he went to the bathroom, so i dragged my mom to the computer and wrote the message down. She gasped and before i could delete it, i turned around and he was standing there with a knife. Before he was about to kill me i woke up.