Roger Dingledine:
we have a plausible guess about where they came from, and we contacted the company that we think controls the IP addresses, so they can figure it out / clean up as needed.
Interesting. I'm curious, how did you link the IP addresses to the company? Is your guess that the company set up relays or that someone used that company's servers to setup relays? ("clean up" sounds like someone used their servers in an unauthorized way)