Well it looks like you have a little good news , the police have some possible suspects, If I were you I would sue the 21 and 19 year old and the 16 year olds parents, Even if they don't have any money you can garnish their wages and put a lien on future earnings. Make their lives as miserable as possible, arm yourself and hope they try it again when you are home.Little worthless maggots, to bad the car didn"t hit them. Hopefully they will be charged and do a little time.