The NASDAQ had already lost support prior to yesterday, but there was no acceleration to the downside.
The S&P left another 'bull trap' in its wake but didn't give up (newer) channel support; it's still a long way from the long-standing summer channel - illustrated by the thin blue line.
For today, keep an eye on the Russell 2000. It looks like it wants to lead lower and this will be bad news for other indices. If there is to be a bullish surge, then the NASDAQ 100 will be the index most likely to lead out.