Breakdown in banks?

The banks sold off this morning. While it is still early in the day, it looks like there's a breakdown in banks. There's a sell signal from the MACD and the RSI just put in a lower low. Meanwhile the banking index broke below support from the lows of early December.

However, the banking index is very oversold, and three of the heavyweights, BAC, C and JPM are siting on support. Perhaps one more move down is needed to confirm this breakdown