Well to help a bit:
Where: Local Park
When: For example we'll use, Noon (12:00)
The victim was walking through our local park before being attacked.
The bag was stolen from her, the attacker went up and grabbed it.
Description of attacker:
For example we'll say he had brown hair and brown eyes, and was tall and skinny.
When something like this happens never be a bystander, try to help the victim in any way possible, for example we'll say we went up and tried to help her get the bag back.
I hope this helps but again this question wasn't very straightforward, so I can't give you precise answers.