Hmm
Do you live in a urban, rural or in/around a wooded area?
Have neighbors been talking about missing animals lately?
If you live near a forest with rabbits, it could be that someone has carelessly set snares close to where you live. You should look around for anything out of place - like high visibility ribbon or used shotgun shells - , this is a common method to mark the location of snares as they can be EXTREMELY difficult to see. Snares will most often be placed on heavily used "rabbit leads" at a choke point where the rabbit can not walk around it.
If you live in a rural/urban area, go for a walk along the roads and have a look in the ditches as people will sometimes toss dead cats into ditches.
-edit- why the hell would you think someone is trapping cats? (if it's snares he's not actually after cats, i would hope) -edit-