There's never a guarantee ANYWHERE that if you let your children out alone that they're 100% safe.
Call the local police dept and ask them about crime in that area. Knock on a few doors in the neighborhood you're thinking of moving to. Check out the local schools, they'll be able to give you stats on them.
Realtors are not allowed to answer specific questions like that. But you can call the local police department and ask questions. Also, check out web sites that give statistics on crime in that area like the ones below;
It may be a little forward but go to the area that you are considering and knock on a few neighbor's doors and ask questions, or go visit a few schools in the area and talk to a few teachers or the Principal.
I hope this helps,