How can a day trader figure out what event might have triggered a sudden spike in volume that occurs after hours?
Example: a quarter past midnight (NYSE time), the ES Dec 2016 future is crawling slowly... then suddenly, THIS:
From a volume of zero, to a volume of 1000 in 5 seconds.
I know that ES futures volume picks up after midnight, but this occured 15 minutes later, and the general question is,
Where can one find rapid-fire market news after hours?
Some Twitter account perhaps? Traders' chatrooms?