Employers in the U.S. added fewer workers than forecast in April and the jobless rate unexpectedly declined as people left the labor force, underscoring concern the world's largest economy may be losing speed.

Payrolls climbed 115,000, the smallest gain in six months, after a revised 154,000 rise in March that was more than initially estimated, Labor Department figures showed today in Washington. The median estimate of 85 economists surveyed by Bloomberg News called for a 160,000 advance. The jobless rate fell to a three-year low of 8.1 percent and earnings stagnated.

A slowdown in hiring as corporate optimism cools may restrain the wage growth needed to fuel consumer spending, which accounts for about 70 percent of the economy. Federal Reserve policy makers view unemployment as "elevated" and plan to hold borrowing costs low through late 2014.