US STOCKS-Wall St weaker as Greece debt talks hit stalemate
* Greece talks suffer setback after IMF quits
* May producer prices record biggest gain in more than 2-1/2 years
* Twitter rises after CEO quits
* Indexes down: Dow 0.9 pct, S&P 0.8 pct, Nasdaq 0.7 pct (Adds details, changes comment, updates prices)
By Tanya Agrawal
June 12 (Reuters) - U.S. stocks fell in lackluster trading and trimmed their gains for the week, pressured by a setback in Greece's debt talks and increased possibility of a September rate hike.
Still, the S&P 500 and the Dow Jones Industrial Average were on track to close higher for the week, after posting declines for two weeks in a row.
Greece said it would not cross its "red lines" as it looked to intensify political negotiations for an agreement, saying the International Monetary Fund's move to quit bailout talks was aimed at putting pressure on Athens.
Investors were also edgy ahead of the U.S. Federal Reserve's Open Market Committee meeting next week - the central bank's last meeting before September - which may provide clues on the timing of an interest rate hike. Continuación...