By Ryan Vlastelica
NEW YORK (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
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.
Trading may be volatile ahead of the March payroll report, due on Friday, when the stock market is closed for the Good Friday holiday. If the report is strong, investors could view the U.S. Federal Reserve as more likely to raise rates earlier than currently expected.
In company news, Endurance Specialty Holdings Ltd
The news follows a number of big M&A deals announced on Monday that contributed to the market's broad advance. Charter rose 11 percent to $203.50 before the bell on Tuesday.
International Business Machines Corp
Office Depot Inc
Futures snapshot at 8:18:
* S&P 500 e-minis
* Nasdaq 100 e-minis
* Dow e-minis <1YMc1> were down 87 points, or 0.49 percent, with 27,608 contracts changing hands.
(Editing by Jeffrey Benkoe and Meredith Mazzilli)