a blog invasion

I checked my email this morning to find I had 49 new comments on my blog, I was shocked, who would comment that many times in one night? nbalike, that's who, and they weren't commenting, they were invading my blog for their own purposes, to post links to some video games or something like it. This person posted around 45 comments on separate entries to post links to different gaming sites. So, I'm in the process of removing his/her comments and trying to find out what to do to report them. If you have insight on this issue, please let me know.