The U.S. economy added 173,000 jobs in August, lower than expected, in a report that gave fuel to both sides of the rate-hike debate, the Bureau of Labor Statistics reported Friday.

In addition to the new jobs, the unemployment rate fell to 5.1 percent. A separate measure that includes those who have stopped looking for work or are working part time for economic reasons edged lower to 10.3 percent. The labor force participation rate remained mired near its lowest level since the late 1970s at 62.6 percent.