Gritty sight near 93rd and Aurora today

Today I was walking on Aurora.  While I was walking on the West side of Aurora, I looked up and saw what I thought was a pack of cigarettes jammed into the chain link fence.  Upon closer examination, I noticed that it wasn’t cigarettes protruding from the pack of Marlboro Reds, it was hypodermic needles!  I looked closer, and I also saw a metallic spoon jammed into the pack, along with the needles.  My guess is that this is the remains of a drug user’s supply.

I didn’t feel comfortable touching this item.  I snapped a picture of it , and moved on.  Does anybody know if there is a city run hotline to report something like this?  What type of etiquette is involved when encountering something like this?