The Fed previously ruled out raising rates at the end of its two-day meeting on Wednesday, and the chances of a hike at the June meeting, while still on the table, have steadily decreased amid a drum-beat of weak first-quarter economic data. Economists say September is more likely than June for the Fed’s so-called “lift-off.” It has kept rates near zero since late 2008 as part of its effort to spur the recovery from the financial crisis.