It certainly looked like a breakout, at least for today, but it would have been more convincing if the volumes had not remained thin. As such it looked like a short squeeze engineered by the wiseguys ahead of the FOMC meeting.
SP 500
NDX
"A new, invisible and at times virtual, tyranny is established, one which unilaterally and irremediably imposes its own laws and rules. Moreover, indebtedness and credit distance countries from their real economy and citizens from their real buying power. Added to this, as if it were needed, is widespread corruption and selfish fiscal evasion which have taken on worldwide dimensions. The will to power and of possession has become limitless." Francis I, 16 May 2013