The Dow and the S&P 500 dropped to session lows on Thursday as financial shares fell sharply heading into the market's close.

* The KBW bank index <.BKX> fell 3 percent.

* The Nasdaq turned negative, giving up gains it had accrued earlier from Comcast Corp's joint venture deal with General Electric Co .

* The Dow Jones industrial average <.DJI> dropped 9.75 points, or 0.09 percent, to 10,442.93. The Standard & Poor's 500 Index <.SPX> dropped 0.45 of a point, or 0.04 percent, to 1,108.79. But the Nasdaq Composite Index <.IXIC> gained 6.32 points, or 0.29 percent, to 2,191.35.

(Reporting by Ellis Mnyandu; Editing by Jan Paschal)