This is definitely strange, but I am not exactly sure what is going on. I hope the site was not hijacked. If you suspect that it was, this link on webmaster world might help:
Proxy Server URLs Can Hijack Your Google Ranking - how to defend?
The article explains what you can do to protect your site from being hijacked (I am not saying yours was, I frankly don't know why the other site has your description).
I looked in Google and see you have a lot of pages indexed:
site:knifecrime.blogspot.com - Google Search You have 88 pages indexed, and I searched "knifecrime" and your site is #1 in google:
knifecrime - Google Search
Can you check your stats to see if you are getting crawled by some strange bots, other than major search engines? If someone is trying to hijack your site, then they would need to crawl it regularly to steal the content.
Let me know what you find out.