US STOCKS-Futures pull back after strong advance
* Oil prices weaken for third straight day, Exxon down early
* Charter to buy Bright Hose for about $10 bln: source
* Investors looking ahead to consumer confidence data
* Futures down: Dow 88 pts, S&P 10.5 pts, Nasdaq 20 pts (Updates prices, adds M&A deals)
By Ryan Vlastelica
NEW YORK, March 31 (Reuters) - U.S. stock index futures were lower on Tuesday, indicating a modest retreat from the previous session's rally, which was the strongest session for the Dow in more than a month.
Energy shares will continue to be in focus as crude oil fell 2.3 percent to $47.58 per barrel, sending Exxon Mobil Corp down 0.7 percent to $85 in premarket trading. Oil is set for its third straight daily decline, losing more than 7 percent in the three days. U.S. crude futures were volatile on Monday, swinging between a gain of 0.6 percent and a decline of 2.6 percent.
Oil was pressured on Tuesday as Iran and six world powers entered a final day of talks on a nuclear deal that could see the energy-rich country increase oil exports to world markets. The talks come at a time when oversupply is already a major concern for energy investors, having contributed to crude falling more than 50 percent from a high reached in June.
Investors will also look ahead to the latest economic data, including the March Chicago Purchasing Managers Index at 9:45 a.m. EDT (1345 GMT) and a reading on March consumer confidence at 10 a.m. Confidence is seen dipping slightly in the latest month. Continuación...