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
“Depart from me, you accursed. For I was hungry and you gave me no food, thirsty and you gave me no drink, a stranger and you did not welcome me, naked and you did not clothe me, sick and in prison and you did not comfort me.' They answer, 'Lord, when was it that we saw you hungry or thirsty or a stranger or naked or sick or in prison, and did not care for you?' He answered, 'Truly I tell you, as you did not do it to one of the least of these, you did not do it for me.’”
Matthew 25:40-46