Realtors are really not your best source for this kind of question. Either explore the information about crime on the available internet sites, or contact the police department, they will gladly give you the information you may be seeking.
Good Luck to you, I am not sure why you are asking the question since you say that you are a home buyer from outside the US, are you looking for an investment property somewhere in the US, or are you looking to buy property for your own use....
As Realtors by law we are not allowed to give you information as to what area to buy in or not to buy in, considered steering and it is against the law....
A Realtor can certainly help you with providing you with available properties in the areas you are interested in, either for personal use or as an investment to rent out, and can give you details about price, value, condition etc. but those other questions you need to explore on the internet or by contacting the local police department.....
Hope this helps a little.
Edith YourRealtor4Life and Chicago / Northshore Expert
Working always in the very BEST interest of her clients
Working with Partner Agents anywhere in the US