Weird sound coming from front end

by Thomas
(Ewa Beach, HI )

I have a 2009 kawasaki ninja zx6r (5,600 mi) and I rode home from work the other night and after about 20 miles on the road, there was this weird rotary sound coming from the front end. I thought something was tangled onto my front wheel and dragging itself on the road, but nothing visible that was broken or damaged. Does anyone have this same problem?