He was posting on 4chan the night before, I came across the thread on Reddit as they quickly put two and two together. The news however are not also connecting the numbers.
http://www.bbc.co.uk/news/world-us-canada-34423387
I have the original thread but it's honestly NSFL, the amount of people supporting him and encouraging him, even going as far as giving him direction on what and how to do it. The original thread can be found for those that seek it, it has no place here. The original post he made is screenshotted and posted to the BBC above.
He did however post a message under that along the lines of ''10 mins to go''
4chan is a pretty disturbing vile place that doesn't help anyone that favours a free internet without censorship.