I need help with the name of a movie. Here is a plot summary: The is a blonde girl is going to be killed on the internet. She is tied to a chair and there is a running clock. The cops find the site, it keeps on changing from one murder to the next. There are hidden messages in the pictures that the cops get via email. The murderer is a serial killer or something from years ago that the cop didn't get when he was younger. The only other thing I remember is that they think the killer is in a trailer under a bridge but when they get there it explodes. I rented this movie within the last year but can't figure it out. Any help appreciated.