US STOCKS-Wall St falls as Greece crisis unresolved; energy shares dip
* Greece talks suffer setback after IMF quits
* U.S. consumer sentiment surges in June
* Next week's Fed policy meeting adds to investor caution
* Twitter rises after CEO quits abruptly
* Indexes down: Dow 0.8 pct, S&P 0.7 pct, Nasdaq 0.6 pct (Updates to close)
By Caroline Valetkevitch
June 12 (Reuters) - U.S. stocks fell on Friday as Greek debt talks hit a stalemate and as concern over how soon the Federal Reserve might raise interest rates kept investors cautious.
Energy shares dropped as oil prices fell for a second straight day. The energy index, down 1.2 percent, led the day's decline, followed by a 1.1 percent drop in the healthcare index.
Upbeat consumer sentiment and other data added to views the economy may be regaining momentum, which increased anxiety for investors ahead of next week's Federal Open Market Committee meeting, the U.S. central bank's last meeting before September. Continuación...