Most officials want to start normalizing interest rates, but they are wary of the risk of raising interest rates too quickly and would prefer to see more convincing evidence that the economic recovery is accelerating.
U.S. crude futures tumbled 3 percent to lead the oil complex down for a second straight day on Tuesday as an investor flight to safe havens continued from worries of a Greece exit from the euro zone and China's deepening stock market losses.
Greek Prime Minister Alexis Tsipras had a final chance to present credible reform proposals to an emergency euro zone summit on Tuesday to persuade skeptical creditors to reopen aid talks before his country's banks run out of money.
European stocks fell and the euro hit a five-week low against the dollar on Tuesday before a euro zone summit to discuss the Greek debt crisis, while a fall in Chinese shares reminded investors of other clouds on the horizon.
Greece's banks will stay closed at least until Friday, four banking sources said on Monday, as the country tries to reopen bailout negotiations with official creditors and save its financial system from collapse.
As Greece heads to a referendum on Sunday that could decide its future in the euro zone, long queues at cash machines have become the most potent symbol of the cost of the deadlock between the left-wing government and its international lenders.
Weaker-than-expected U.S. jobs figures knocked the dollar off a three-week high on Thursday and gave a lift to Wall Street stock futures as the chances of a U.S. rate hike as soon as September took a hit.